Finding the Fourth Proportional to 99,311.27, 137,052.18 and 53,992.31

Step by Step Solution

1. Step 1: Write the proportion equation
   99,311.27 : 137,052.18 = 53,992.31 : x
2. Step 2: Convert to fraction form
   99,311.27/137,052.18 = 53,992.31/x
3. Step 3: Cross multiply
   99,311.27x = 137,052.18 × 53,992.31
4. Step 4: Simplify right side
   99,311.27x = 7,399,763,103.47
5. Step 5: Solve for x
   x = 7,399,763,103.47/99,311.27
6. Step 6: Final answer
   x = 74,510.81