Finding the Fourth Proportional to 99,821.92, 137,754.24 and 57,388.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99,821.92 : 137,754.24 = 57,388.72 : x
2. Step 2: Convert to fraction form
   99,821.92/137,754.24 = 57,388.72/x
3. Step 3: Cross multiply
   99,821.92x = 137,754.24 × 57,388.72
4. Step 4: Simplify right side
   99,821.92x = 7,905,539,508.17
5. Step 5: Solve for x
   x = 7,905,539,508.17/99,821.92
6. Step 6: Final answer
   x = 79,196.43