Finding the Fourth Proportional to 22,789.60, 31,443.76 and 21,204.04

Step by Step Solution

1. Step 1: Write the proportion equation
   22,789.60 : 31,443.76 = 21,204.04 : x
2. Step 2: Convert to fraction form
   22,789.60/31,443.76 = 21,204.04/x
3. Step 3: Cross multiply
   22,789.60x = 31,443.76 × 21,204.04
4. Step 4: Simplify right side
   22,789.60x = 666,734,744.79
5. Step 5: Solve for x
   x = 666,734,744.79/22,789.60
6. Step 6: Final answer
   x = 29,256.10