Finding the Fourth Proportional to 99,880.98, 137,834.37 and 54,558.42

Step by Step Solution

1. Step 1: Write the proportion equation
   99,880.98 : 137,834.37 = 54,558.42 : x
2. Step 2: Convert to fraction form
   99,880.98/137,834.37 = 54,558.42/x
3. Step 3: Cross multiply
   99,880.98x = 137,834.37 × 54,558.42
4. Step 4: Simplify right side
   99,880.98x = 7,520,025,448.90
5. Step 5: Solve for x
   x = 7,520,025,448.90/99,880.98
6. Step 6: Final answer
   x = 75,289.86