Finding the Fourth Proportional to 22,113.84, 30,520 and 12,680.56

Step by Step Solution

1. Step 1: Write the proportion equation
   22,113.84 : 30,520 = 12,680.56 : x
2. Step 2: Convert to fraction form
   22,113.84/30,520 = 12,680.56/x
3. Step 3: Cross multiply
   22,113.84x = 30,520 × 12,680.56
4. Step 4: Simplify right side
   22,113.84x = 387,010,691.20
5. Step 5: Solve for x
   x = 387,010,691.20/22,113.84
6. Step 6: Final answer
   x = 17,500.84