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Finding the Fourth Proportional to 28,987.76, 43,481.60 and 8,211.28

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Solution

The fourth proportional to 28,987.76, 43,481.60 and 8,211.28 is: 12,316.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,987.76 : 43,481.60 = 8,211.28 : x
  2. Step 2: Convert to fraction form
    28,987.76/43,481.60 = 8,211.28/x
  3. Step 3: Cross multiply
    28,987.76x = 43,481.60 × 8,211.28
  4. Step 4: Simplify right side
    28,987.76x = 357,039,592.45
  5. Step 5: Solve for x
    x = 357,039,592.45/28,987.76
  6. Step 6: Final answer
    x = 12,316.91

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