Finding the Fourth Proportional to 87,978.72, 131,988.24 and 28,817.76

Step by Step Solution

1. Step 1: Write the proportion equation
   87,978.72 : 131,988.24 = 28,817.76 : x
2. Step 2: Convert to fraction form
   87,978.72/131,988.24 = 28,817.76/x
3. Step 3: Cross multiply
   87,978.72x = 131,988.24 × 28,817.76
4. Step 4: Simplify right side
   87,978.72x = 3,803,605,423.14
5. Step 5: Solve for x
   x = 3,803,605,423.14/87,978.72
6. Step 6: Final answer
   x = 43,233.24