Finding the Fourth Proportional to 22,680.78, 31,301.40 and 12,611.17

Step by Step Solution

1. Step 1: Write the proportion equation
   22,680.78 : 31,301.40 = 12,611.17 : x
2. Step 2: Convert to fraction form
   22,680.78/31,301.40 = 12,611.17/x
3. Step 3: Cross multiply
   22,680.78x = 31,301.40 × 12,611.17
4. Step 4: Simplify right side
   22,680.78x = 394,747,221.82
5. Step 5: Solve for x
   x = 394,747,221.82/22,680.78
6. Step 6: Final answer
   x = 17,404.48