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Finding the Fourth Proportional to 390,830,978.46, 586,265,321.34 and 128,509,721.67

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Solution

The fourth proportional to 390,830,978.46, 586,265,321.34 and 128,509,721.67 is: 192,770,781.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,830,978.46 : 586,265,321.34 = 128,509,721.67 : x
  2. Step 2: Convert to fraction form
    390,830,978.46/586,265,321.34 = 128,509,721.67/x
  3. Step 3: Cross multiply
    390,830,978.46x = 586,265,321.34 × 128,509,721.67
  4. Step 4: Simplify right side
    390,830,978.46x = 75,340,793,270,176,512
  5. Step 5: Solve for x
    x = 75,340,793,270,176,512/390,830,978.46
  6. Step 6: Final answer
    x = 192,770,781.80

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