Finding the Fourth Proportional to 2,390.72, 3,584.69 and 928.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,390.72 : 3,584.69 = 928.16 : x
2. Step 2: Convert to fraction form
   2,390.72/3,584.69 = 928.16/x
3. Step 3: Cross multiply
   2,390.72x = 3,584.69 × 928.16
4. Step 4: Simplify right side
   2,390.72x = 3,327,161.23
5. Step 5: Solve for x
   x = 3,327,161.23/2,390.72
6. Step 6: Final answer
   x = 1,391.70