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Finding the Fourth Proportional to 15,330, 21,155.40 and 8,706

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Solution

The fourth proportional to 15,330, 21,155.40 and 8,706 is: 12,014.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,330 : 21,155.40 = 8,706 : x
  2. Step 2: Convert to fraction form
    15,330/21,155.40 = 8,706/x
  3. Step 3: Cross multiply
    15,330x = 21,155.40 × 8,706
  4. Step 4: Simplify right side
    15,330x = 184,178,912.40
  5. Step 5: Solve for x
    x = 184,178,912.40/15,330
  6. Step 6: Final answer
    x = 12,014.28

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