Finding the Fourth Proportional to 99,821.17, 137,752.50 and 54,499.15

Step by Step Solution

1. Step 1: Write the proportion equation
   99,821.17 : 137,752.50 = 54,499.15 : x
2. Step 2: Convert to fraction form
   99,821.17/137,752.50 = 54,499.15/x
3. Step 3: Cross multiply
   99,821.17x = 137,752.50 × 54,499.15
4. Step 4: Simplify right side
   99,821.17x = 7,507,393,199.12
5. Step 5: Solve for x
   x = 7,507,393,199.12/99,821.17
6. Step 6: Final answer
   x = 75,208.43