Finding the Fourth Proportional to 99,724.82, 137,610.66 and 55,009.94

Step by Step Solution

1. Step 1: Write the proportion equation
   99,724.82 : 137,610.66 = 55,009.94 : x
2. Step 2: Convert to fraction form
   99,724.82/137,610.66 = 55,009.94/x
3. Step 3: Cross multiply
   99,724.82x = 137,610.66 × 55,009.94
4. Step 4: Simplify right side
   99,724.82x = 7,569,954,149.96
5. Step 5: Solve for x
   x = 7,569,954,149.96/99,724.82
6. Step 6: Final answer
   x = 75,908.43