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Finding the Fourth Proportional to 31,143.94, 42,978.62 and 19,214.20

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Solution

The fourth proportional to 31,143.94, 42,978.62 and 19,214.20 is: 26,515.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,143.94 : 42,978.62 = 19,214.20 : x
  2. Step 2: Convert to fraction form
    31,143.94/42,978.62 = 19,214.20/x
  3. Step 3: Cross multiply
    31,143.94x = 42,978.62 × 19,214.20
  4. Step 4: Simplify right side
    31,143.94x = 825,799,800.40
  5. Step 5: Solve for x
    x = 825,799,800.40/31,143.94
  6. Step 6: Final answer
    x = 26,515.59

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