Finding the Fourth Proportional to 22,131.81, 30,540.72 and 12,699.75

Step by Step Solution

1. Step 1: Write the proportion equation
   22,131.81 : 30,540.72 = 12,699.75 : x
2. Step 2: Convert to fraction form
   22,131.81/30,540.72 = 12,699.75/x
3. Step 3: Cross multiply
   22,131.81x = 30,540.72 × 12,699.75
4. Step 4: Simplify right side
   22,131.81x = 387,859,508.82
5. Step 5: Solve for x
   x = 387,859,508.82/22,131.81
6. Step 6: Final answer
   x = 17,524.98