Finding the Fourth Proportional to 99,800.76, 137,719.98 and 55,080.12

Step by Step Solution

1. Step 1: Write the proportion equation
   99,800.76 : 137,719.98 = 55,080.12 : x
2. Step 2: Convert to fraction form
   99,800.76/137,719.98 = 55,080.12/x
3. Step 3: Cross multiply
   99,800.76x = 137,719.98 × 55,080.12
4. Step 4: Simplify right side
   99,800.76x = 7,585,633,024.80
5. Step 5: Solve for x
   x = 7,585,633,024.80/99,800.76
6. Step 6: Final answer
   x = 76,007.77