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Finding the Fourth Proportional to 428,170.90, 642,289.56 and 128,628.04

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Solution

The fourth proportional to 428,170.90, 642,289.56 and 128,628.04 is: 192,952.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,170.90 : 642,289.56 = 128,628.04 : x
  2. Step 2: Convert to fraction form
    428,170.90/642,289.56 = 128,628.04/x
  3. Step 3: Cross multiply
    428,170.90x = 642,289.56 × 128,628.04
  4. Step 4: Simplify right side
    428,170.90x = 82,616,447,215.26
  5. Step 5: Solve for x
    x = 82,616,447,215.26/428,170.90
  6. Step 6: Final answer
    x = 192,952.04

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