Finding the Fourth Proportional to 22,564.50, 31,139.04 and 12,628.50

Step by Step Solution

1. Step 1: Write the proportion equation
   22,564.50 : 31,139.04 = 12,628.50 : x
2. Step 2: Convert to fraction form
   22,564.50/31,139.04 = 12,628.50/x
3. Step 3: Cross multiply
   22,564.50x = 31,139.04 × 12,628.50
4. Step 4: Simplify right side
   22,564.50x = 393,239,366.64
5. Step 5: Solve for x
   x = 393,239,366.64/22,564.50
6. Step 6: Final answer
   x = 17,427.35