Finding the Fourth Proportional to 2,659.42, 3,989.16 and 928.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,659.42 : 3,989.16 = 928.04 : x
2. Step 2: Convert to fraction form
   2,659.42/3,989.16 = 928.04/x
3. Step 3: Cross multiply
   2,659.42x = 3,989.16 × 928.04
4. Step 4: Simplify right side
   2,659.42x = 3,702,100.05
5. Step 5: Solve for x
   x = 3,702,100.05/2,659.42
6. Step 6: Final answer
   x = 1,392.07