Finding the Fourth Proportional to 99,580.83, 137,419.92 and 54,259.35

Step by Step Solution

1. Step 1: Write the proportion equation
   99,580.83 : 137,419.92 = 54,259.35 : x
2. Step 2: Convert to fraction form
   99,580.83/137,419.92 = 54,259.35/x
3. Step 3: Cross multiply
   99,580.83x = 137,419.92 × 54,259.35
4. Step 4: Simplify right side
   99,580.83x = 7,456,315,536.25
5. Step 5: Solve for x
   x = 7,456,315,536.25/99,580.83
6. Step 6: Final answer
   x = 74,877.02