Finding the Fourth Proportional to 99,123.20, 136,727.78 and 58,808.42

Step by Step Solution

1. Step 1: Write the proportion equation
   99,123.20 : 136,727.78 = 58,808.42 : x
2. Step 2: Convert to fraction form
   99,123.20/136,727.78 = 58,808.42/x
3. Step 3: Cross multiply
   99,123.20x = 136,727.78 × 58,808.42
4. Step 4: Simplify right side
   99,123.20x = 8,040,744,711.91
5. Step 5: Solve for x
   x = 8,040,744,711.91/99,123.20
6. Step 6: Final answer
   x = 81,118.70