Finding the Fourth Proportional to 22,330.72, 30,815.28 and 12,898.72

Step by Step Solution

1. Step 1: Write the proportion equation
   22,330.72 : 30,815.28 = 12,898.72 : x
2. Step 2: Convert to fraction form
   22,330.72/30,815.28 = 12,898.72/x
3. Step 3: Cross multiply
   22,330.72x = 30,815.28 × 12,898.72
4. Step 4: Simplify right side
   22,330.72x = 397,477,668.44
5. Step 5: Solve for x
   x = 397,477,668.44/22,330.72
6. Step 6: Final answer
   x = 17,799.59