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Finding the Fourth Proportional to 81,186.71, 121,780.22 and 31,290.30

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Solution

The fourth proportional to 81,186.71, 121,780.22 and 31,290.30 is: 46,935.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,186.71 : 121,780.22 = 31,290.30 : x
  2. Step 2: Convert to fraction form
    81,186.71/121,780.22 = 31,290.30/x
  3. Step 3: Cross multiply
    81,186.71x = 121,780.22 × 31,290.30
  4. Step 4: Simplify right side
    81,186.71x = 3,810,539,461.41
  5. Step 5: Solve for x
    x = 3,810,539,461.41/81,186.71
  6. Step 6: Final answer
    x = 46,935.51

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