Finding the Fourth Proportional to 1,392.24, 2,086.68 and 1,282.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.24 : 2,086.68 = 1,282.80 : x
2. Step 2: Convert to fraction form
   1,392.24/2,086.68 = 1,282.80/x
3. Step 3: Cross multiply
   1,392.24x = 2,086.68 × 1,282.80
4. Step 4: Simplify right side
   1,392.24x = 2,676,793.10
5. Step 5: Solve for x
   x = 2,676,793.10/1,392.24
6. Step 6: Final answer
   x = 1,922.65