Finding the Fourth Proportional to 2,660.42, 3,991.35 and 929.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,660.42 : 3,991.35 = 929.18 : x
2. Step 2: Convert to fraction form
   2,660.42/3,991.35 = 929.18/x
3. Step 3: Cross multiply
   2,660.42x = 3,991.35 × 929.18
4. Step 4: Simplify right side
   2,660.42x = 3,708,682.59
5. Step 5: Solve for x
   x = 3,708,682.59/2,660.42
6. Step 6: Final answer
   x = 1,394.02