Finding the Fourth Proportional to 22,225.78, 30,661.30 and 12,788.88

Step by Step Solution

1. Step 1: Write the proportion equation
   22,225.78 : 30,661.30 = 12,788.88 : x
2. Step 2: Convert to fraction form
   22,225.78/30,661.30 = 12,788.88/x
3. Step 3: Cross multiply
   22,225.78x = 30,661.30 × 12,788.88
4. Step 4: Simplify right side
   22,225.78x = 392,123,686.34
5. Step 5: Solve for x
   x = 392,123,686.34/22,225.78
6. Step 6: Final answer
   x = 17,642.74