Finding the Fourth Proportional to 22,128.60, 30,535.74 and 12,695.16

Step by Step Solution

1. Step 1: Write the proportion equation
   22,128.60 : 30,535.74 = 12,695.16 : x
2. Step 2: Convert to fraction form
   22,128.60/30,535.74 = 12,695.16/x
3. Step 3: Cross multiply
   22,128.60x = 30,535.74 × 12,695.16
4. Step 4: Simplify right side
   22,128.60x = 387,656,105.02
5. Step 5: Solve for x
   x = 387,656,105.02/22,128.60
6. Step 6: Final answer
   x = 17,518.33