Finding the Fourth Proportional to 99,960.42, 137,942.82 and 54,638.52

Step by Step Solution

1. Step 1: Write the proportion equation
   99,960.42 : 137,942.82 = 54,638.52 : x
2. Step 2: Convert to fraction form
   99,960.42/137,942.82 = 54,638.52/x
3. Step 3: Cross multiply
   99,960.42x = 137,942.82 × 54,638.52
4. Step 4: Simplify right side
   99,960.42x = 7,536,991,529.43
5. Step 5: Solve for x
   x = 7,536,991,529.43/99,960.42
6. Step 6: Final answer
   x = 75,399.76