Finding the Fourth Proportional to 10,514.66, 15,687.18 and 10,131.80

Step by Step Solution

1. Step 1: Write the proportion equation
   10,514.66 : 15,687.18 = 10,131.80 : x
2. Step 2: Convert to fraction form
   10,514.66/15,687.18 = 10,131.80/x
3. Step 3: Cross multiply
   10,514.66x = 15,687.18 × 10,131.80
4. Step 4: Simplify right side
   10,514.66x = 158,939,291.89
5. Step 5: Solve for x
   x = 158,939,291.89/10,514.66
6. Step 6: Final answer
   x = 15,115.98