Finding the Fourth Proportional to 99,118.59, 136,781.61 and 56,097.31

Step by Step Solution

1. Step 1: Write the proportion equation
   99,118.59 : 136,781.61 = 56,097.31 : x
2. Step 2: Convert to fraction form
   99,118.59/136,781.61 = 56,097.31/x
3. Step 3: Cross multiply
   99,118.59x = 136,781.61 × 56,097.31
4. Step 4: Simplify right side
   99,118.59x = 7,673,080,398.16
5. Step 5: Solve for x
   x = 7,673,080,398.16/99,118.59
6. Step 6: Final answer
   x = 77,413.13