Finding the Fourth Proportional to 99,693.57, 137,573.33 and 54,981.57

Step by Step Solution

1. Step 1: Write the proportion equation
   99,693.57 : 137,573.33 = 54,981.57 : x
2. Step 2: Convert to fraction form
   99,693.57/137,573.33 = 54,981.57/x
3. Step 3: Cross multiply
   99,693.57x = 137,573.33 × 54,981.57
4. Step 4: Simplify right side
   99,693.57x = 7,563,997,398.62
5. Step 5: Solve for x
   x = 7,563,997,398.62/99,693.57
6. Step 6: Final answer
   x = 75,872.47