Finding the Fourth Proportional to 99,308.54, 137,048.45 and 53,989.59

Step by Step Solution

1. Step 1: Write the proportion equation
   99,308.54 : 137,048.45 = 53,989.59 : x
2. Step 2: Convert to fraction form
   99,308.54/137,048.45 = 53,989.59/x
3. Step 3: Cross multiply
   99,308.54x = 137,048.45 × 53,989.59
4. Step 4: Simplify right side
   99,308.54x = 7,399,189,355.69
5. Step 5: Solve for x
   x = 7,399,189,355.69/99,308.54
6. Step 6: Final answer
   x = 74,507.08