Finding the Fourth Proportional to 99,862.72, 137,811.36 and 55,150.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99,862.72 : 137,811.36 = 55,150.72 : x
2. Step 2: Convert to fraction form
   99,862.72/137,811.36 = 55,150.72/x
3. Step 3: Cross multiply
   99,862.72x = 137,811.36 × 55,150.72
4. Step 4: Simplify right side
   99,862.72x = 7,600,395,728.18
5. Step 5: Solve for x
   x = 7,600,395,728.18/99,862.72
6. Step 6: Final answer
   x = 76,108.44