Finding the Fourth Proportional to 2,659.92, 3,991.65 and 928.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,659.92 : 3,991.65 = 928.54 : x
2. Step 2: Convert to fraction form
   2,659.92/3,991.65 = 928.54/x
3. Step 3: Cross multiply
   2,659.92x = 3,991.65 × 928.54
4. Step 4: Simplify right side
   2,659.92x = 3,706,406.69
5. Step 5: Solve for x
   x = 3,706,406.69/2,659.92
6. Step 6: Final answer
   x = 1,393.43