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Finding the Fourth Proportional to 31,065.81, 42,870.87 and 16,918.71

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Solution

The fourth proportional to 31,065.81, 42,870.87 and 16,918.71 is: 23,347.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,065.81 : 42,870.87 = 16,918.71 : x
  2. Step 2: Convert to fraction form
    31,065.81/42,870.87 = 16,918.71/x
  3. Step 3: Cross multiply
    31,065.81x = 42,870.87 × 16,918.71
  4. Step 4: Simplify right side
    31,065.81x = 725,319,816.98
  5. Step 5: Solve for x
    x = 725,319,816.98/31,065.81
  6. Step 6: Final answer
    x = 23,347.85

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