Finding the Fourth Proportional to 99,665.57, 149,559.38 and 39,722.79

Step by Step Solution

1. Step 1: Write the proportion equation
   99,665.57 : 149,559.38 = 39,722.79 : x
2. Step 2: Convert to fraction form
   99,665.57/149,559.38 = 39,722.79/x
3. Step 3: Cross multiply
   99,665.57x = 149,559.38 × 39,722.79
4. Step 4: Simplify right side
   99,665.57x = 5,940,915,645.66
5. Step 5: Solve for x
   x = 5,940,915,645.66/99,665.57
6. Step 6: Final answer
   x = 59,608.51