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Finding the Fourth Proportional to 20,994.97, 28,975.11 and 15,680.56

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Solution

The fourth proportional to 20,994.97, 28,975.11 and 15,680.56 is: 21,640.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,994.97 : 28,975.11 = 15,680.56 : x
  2. Step 2: Convert to fraction form
    20,994.97/28,975.11 = 15,680.56/x
  3. Step 3: Cross multiply
    20,994.97x = 28,975.11 × 15,680.56
  4. Step 4: Simplify right side
    20,994.97x = 454,345,872.46
  5. Step 5: Solve for x
    x = 454,345,872.46/20,994.97
  6. Step 6: Final answer
    x = 21,640.70

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