Finding the Fourth Proportional to 2,390.74, 3,584.72 and 928.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,390.74 : 3,584.72 = 928.18 : x
2. Step 2: Convert to fraction form
   2,390.74/3,584.72 = 928.18/x
3. Step 3: Cross multiply
   2,390.74x = 3,584.72 × 928.18
4. Step 4: Simplify right side
   2,390.74x = 3,327,265.41
5. Step 5: Solve for x
   x = 3,327,265.41/2,390.74
6. Step 6: Final answer
   x = 1,391.73