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Finding the Fourth Proportional to 74,390, 111,591.48 and 18,986

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Solution

The fourth proportional to 74,390, 111,591.48 and 18,986 is: 28,480.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,390 : 111,591.48 = 18,986 : x
  2. Step 2: Convert to fraction form
    74,390/111,591.48 = 18,986/x
  3. Step 3: Cross multiply
    74,390x = 111,591.48 × 18,986
  4. Step 4: Simplify right side
    74,390x = 2,118,675,839.28
  5. Step 5: Solve for x
    x = 2,118,675,839.28/74,390
  6. Step 6: Final answer
    x = 28,480.65

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