Finding the Fourth Proportional to 99,008.10, 136,618.59 and 56,569.38

Step by Step Solution

1. Step 1: Write the proportion equation
   99,008.10 : 136,618.59 = 56,569.38 : x
2. Step 2: Convert to fraction form
   99,008.10/136,618.59 = 56,569.38/x
3. Step 3: Cross multiply
   99,008.10x = 136,618.59 × 56,569.38
4. Step 4: Simplify right side
   99,008.10x = 7,728,428,932.77
5. Step 5: Solve for x
   x = 7,728,428,932.77/99,008.10
6. Step 6: Final answer
   x = 78,058.55