Finding the Fourth Proportional to 99,308.69, 137,045.42 and 56,296.29

Step by Step Solution

1. Step 1: Write the proportion equation
   99,308.69 : 137,045.42 = 56,296.29 : x
2. Step 2: Convert to fraction form
   99,308.69/137,045.42 = 56,296.29/x
3. Step 3: Cross multiply
   99,308.69x = 137,045.42 × 56,296.29
4. Step 4: Simplify right side
   99,308.69x = 7,715,149,151.04
5. Step 5: Solve for x
   x = 7,715,149,151.04/99,308.69
6. Step 6: Final answer
   x = 77,688.56