Finding the Fourth Proportional to 99,820.62, 137,751.57 and 54,499.10

Step by Step Solution

1. Step 1: Write the proportion equation
   99,820.62 : 137,751.57 = 54,499.10 : x
2. Step 2: Convert to fraction form
   99,820.62/137,751.57 = 54,499.10/x
3. Step 3: Cross multiply
   99,820.62x = 137,751.57 × 54,499.10
4. Step 4: Simplify right side
   99,820.62x = 7,507,335,899.83
5. Step 5: Solve for x
   x = 7,507,335,899.83/99,820.62
6. Step 6: Final answer
   x = 75,208.27