Finding the Fourth Proportional to 99,710.12, 137,597.78 and 54,998.12

Step by Step Solution

1. Step 1: Write the proportion equation
   99,710.12 : 137,597.78 = 54,998.12 : x
2. Step 2: Convert to fraction form
   99,710.12/137,597.78 = 54,998.12/x
3. Step 3: Cross multiply
   99,710.12x = 137,597.78 × 54,998.12
4. Step 4: Simplify right side
   99,710.12x = 7,567,619,216.17
5. Step 5: Solve for x
   x = 7,567,619,216.17/99,710.12
6. Step 6: Final answer
   x = 75,896.20