Finding the Fourth Proportional to 99,142.48, 136,841.88 and 56,714.32

Step by Step Solution

1. Step 1: Write the proportion equation
   99,142.48 : 136,841.88 = 56,714.32 : x
2. Step 2: Convert to fraction form
   99,142.48/136,841.88 = 56,714.32/x
3. Step 3: Cross multiply
   99,142.48x = 136,841.88 × 56,714.32
4. Step 4: Simplify right side
   99,142.48x = 7,760,894,171.72
5. Step 5: Solve for x
   x = 7,760,894,171.72/99,142.48
6. Step 6: Final answer
   x = 78,280.21