Finding the Fourth Proportional to 91,899.72, 137,904.84 and 39,309.24

Step by Step Solution

1. Step 1: Write the proportion equation
   91,899.72 : 137,904.84 = 39,309.24 : x
2. Step 2: Convert to fraction form
   91,899.72/137,904.84 = 39,309.24/x
3. Step 3: Cross multiply
   91,899.72x = 137,904.84 × 39,309.24
4. Step 4: Simplify right side
   91,899.72x = 5,420,934,452.72
5. Step 5: Solve for x
   x = 5,420,934,452.72/91,899.72
6. Step 6: Final answer
   x = 58,987.50