Finding the Fourth Proportional to 99,399.76, 137,161.43 and 59,105.74

Step by Step Solution

1. Step 1: Write the proportion equation
   99,399.76 : 137,161.43 = 59,105.74 : x
2. Step 2: Convert to fraction form
   99,399.76/137,161.43 = 59,105.74/x
3. Step 3: Cross multiply
   99,399.76x = 137,161.43 × 59,105.74
4. Step 4: Simplify right side
   99,399.76x = 8,107,027,819.61
5. Step 5: Solve for x
   x = 8,107,027,819.61/99,399.76
6. Step 6: Final answer
   x = 81,559.83