Finding the Fourth Proportional to 99,915.27, 137,878.71 and 54,591.12

Step by Step Solution

1. Step 1: Write the proportion equation
   99,915.27 : 137,878.71 = 54,591.12 : x
2. Step 2: Convert to fraction form
   99,915.27/137,878.71 = 54,591.12/x
3. Step 3: Cross multiply
   99,915.27x = 137,878.71 × 54,591.12
4. Step 4: Simplify right side
   99,915.27x = 7,526,953,203.06
5. Step 5: Solve for x
   x = 7,526,953,203.06/99,915.27
6. Step 6: Final answer
   x = 75,333.36