Finding the Fourth Proportional to 99,039.60, 136,648.28 and 58,719.83

Step by Step Solution

1. Step 1: Write the proportion equation
   99,039.60 : 136,648.28 = 58,719.83 : x
2. Step 2: Convert to fraction form
   99,039.60/136,648.28 = 58,719.83/x
3. Step 3: Cross multiply
   99,039.60x = 136,648.28 × 58,719.83
4. Step 4: Simplify right side
   99,039.60x = 8,023,962,794.55
5. Step 5: Solve for x
   x = 8,023,962,794.55/99,039.60
6. Step 6: Final answer
   x = 81,017.72