Finding the Fourth Proportional to 99,689.76, 137,566.38 and 56,663.27

Step by Step Solution

1. Step 1: Write the proportion equation
   99,689.76 : 137,566.38 = 56,663.27 : x
2. Step 2: Convert to fraction form
   99,689.76/137,566.38 = 56,663.27/x
3. Step 3: Cross multiply
   99,689.76x = 137,566.38 × 56,663.27
4. Step 4: Simplify right side
   99,689.76x = 7,794,960,548.42
5. Step 5: Solve for x
   x = 7,794,960,548.42/99,689.76
6. Step 6: Final answer
   x = 78,192.19