Finding the Fourth Proportional to 99,233.78, 136,943.55 and 53,912.09

Step by Step Solution

1. Step 1: Write the proportion equation
   99,233.78 : 136,943.55 = 53,912.09 : x
2. Step 2: Convert to fraction form
   99,233.78/136,943.55 = 53,912.09/x
3. Step 3: Cross multiply
   99,233.78x = 136,943.55 × 53,912.09
4. Step 4: Simplify right side
   99,233.78x = 7,382,912,992.52
5. Step 5: Solve for x
   x = 7,382,912,992.52/99,233.78
6. Step 6: Final answer
   x = 74,399.19