Finding the Fourth Proportional to 10,488.88, 15,731.21 and 5,149.81

Step by Step Solution

1. Step 1: Write the proportion equation
   10,488.88 : 15,731.21 = 5,149.81 : x
2. Step 2: Convert to fraction form
   10,488.88/15,731.21 = 5,149.81/x
3. Step 3: Cross multiply
   10,488.88x = 15,731.21 × 5,149.81
4. Step 4: Simplify right side
   10,488.88x = 81,012,782.25
5. Step 5: Solve for x
   x = 81,012,782.25/10,488.88
6. Step 6: Final answer
   x = 7,723.68