Finding the Fourth Proportional to 99,908.91, 137,872.69 and 54,585.92

Step by Step Solution

1. Step 1: Write the proportion equation
   99,908.91 : 137,872.69 = 54,585.92 : x
2. Step 2: Convert to fraction form
   99,908.91/137,872.69 = 54,585.92/x
3. Step 3: Cross multiply
   99,908.91x = 137,872.69 × 54,585.92
4. Step 4: Simplify right side
   99,908.91x = 7,525,907,524.18
5. Step 5: Solve for x
   x = 7,525,907,524.18/99,908.91
6. Step 6: Final answer
   x = 75,327.69