Finding the Fourth Proportional to 22,256, 30,713.28 and 12,320

Step by Step Solution

1. Step 1: Write the proportion equation
   22,256 : 30,713.28 = 12,320 : x
2. Step 2: Convert to fraction form
   22,256/30,713.28 = 12,320/x
3. Step 3: Cross multiply
   22,256x = 30,713.28 × 12,320
4. Step 4: Simplify right side
   22,256x = 378,387,609.60
5. Step 5: Solve for x
   x = 378,387,609.60/22,256
6. Step 6: Final answer
   x = 17,001.60