Finding the Fourth Proportional to 108,708.72, 149,949 and 78,538.38

Step by Step Solution

1. Step 1: Write the proportion equation
   108,708.72 : 149,949 = 78,538.38 : x
2. Step 2: Convert to fraction form
   108,708.72/149,949 = 78,538.38/x
3. Step 3: Cross multiply
   108,708.72x = 149,949 × 78,538.38
4. Step 4: Simplify right side
   108,708.72x = 11,776,751,542.62
5. Step 5: Solve for x
   x = 11,776,751,542.62/108,708.72
6. Step 6: Final answer
   x = 108,333.09