Finding the Fourth Proportional to 99,821.92, 137,753.31 and 54,499.51

Step by Step Solution

1. Step 1: Write the proportion equation
   99,821.92 : 137,753.31 = 54,499.51 : x
2. Step 2: Convert to fraction form
   99,821.92/137,753.31 = 54,499.51/x
3. Step 3: Cross multiply
   99,821.92x = 137,753.31 × 54,499.51
4. Step 4: Simplify right side
   99,821.92x = 7,507,487,895.88
5. Step 5: Solve for x
   x = 7,507,487,895.88/99,821.92
6. Step 6: Final answer
   x = 75,208.81