Finding the Fourth Proportional to 99,081.05, 136,727.52 and 56,642.31

Step by Step Solution

1. Step 1: Write the proportion equation
   99,081.05 : 136,727.52 = 56,642.31 : x
2. Step 2: Convert to fraction form
   99,081.05/136,727.52 = 56,642.31/x
3. Step 3: Cross multiply
   99,081.05x = 136,727.52 × 56,642.31
4. Step 4: Simplify right side
   99,081.05x = 7,744,563,086.10
5. Step 5: Solve for x
   x = 7,744,563,086.10/99,081.05
6. Step 6: Final answer
   x = 78,163.92