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Finding the Fourth Proportional to 138,928.78, 208,171.73 and 88,967.78

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Solution

The fourth proportional to 138,928.78, 208,171.73 and 88,967.78 is: 133,309.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,928.78 : 208,171.73 = 88,967.78 : x
  2. Step 2: Convert to fraction form
    138,928.78/208,171.73 = 88,967.78/x
  3. Step 3: Cross multiply
    138,928.78x = 208,171.73 × 88,967.78
  4. Step 4: Simplify right side
    138,928.78x = 18,520,576,676.86
  5. Step 5: Solve for x
    x = 18,520,576,676.86/138,928.78
  6. Step 6: Final answer
    x = 133,309.86

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