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Finding the Fourth Proportional to 390,221.76, 538,507.68 and 211,373.76

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Solution

The fourth proportional to 390,221.76, 538,507.68 and 211,373.76 is: 291,696.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,221.76 : 538,507.68 = 211,373.76 : x
  2. Step 2: Convert to fraction form
    390,221.76/538,507.68 = 211,373.76/x
  3. Step 3: Cross multiply
    390,221.76x = 538,507.68 × 211,373.76
  4. Step 4: Simplify right side
    390,221.76x = 113,826,393,110.48
  5. Step 5: Solve for x
    x = 113,826,393,110.48/390,221.76
  6. Step 6: Final answer
    x = 291,696.68

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