Finding the Fourth Proportional to 22,128.84, 30,535.92 and 12,697.20

Step by Step Solution

1. Step 1: Write the proportion equation
   22,128.84 : 30,535.92 = 12,697.20 : x
2. Step 2: Convert to fraction form
   22,128.84/30,535.92 = 12,697.20/x
3. Step 3: Cross multiply
   22,128.84x = 30,535.92 × 12,697.20
4. Step 4: Simplify right side
   22,128.84x = 387,720,683.42
5. Step 5: Solve for x
   x = 387,720,683.42/22,128.84
6. Step 6: Final answer
   x = 17,521.06