Finding the Fourth Proportional to 22,085.64, 30,478.17 and 12,660.48

Step by Step Solution

1. Step 1: Write the proportion equation
   22,085.64 : 30,478.17 = 12,660.48 : x
2. Step 2: Convert to fraction form
   22,085.64/30,478.17 = 12,660.48/x
3. Step 3: Cross multiply
   22,085.64x = 30,478.17 × 12,660.48
4. Step 4: Simplify right side
   22,085.64x = 385,868,261.72
5. Step 5: Solve for x
   x = 385,868,261.72/22,085.64
6. Step 6: Final answer
   x = 17,471.45