Finding the Fourth Proportional to 99,123.20, 136,756.72 and 56,651.68

Step by Step Solution

1. Step 1: Write the proportion equation
   99,123.20 : 136,756.72 = 56,651.68 : x
2. Step 2: Convert to fraction form
   99,123.20/136,756.72 = 56,651.68/x
3. Step 3: Cross multiply
   99,123.20x = 136,756.72 × 56,651.68
4. Step 4: Simplify right side
   99,123.20x = 7,747,497,939.29
5. Step 5: Solve for x
   x = 7,747,497,939.29/99,123.20
6. Step 6: Final answer
   x = 78,160.29