Finding the Fourth Proportional to 2,321.16, 3,480.78 and 1,590.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,321.16 : 3,480.78 = 1,590.96 : x
2. Step 2: Convert to fraction form
   2,321.16/3,480.78 = 1,590.96/x
3. Step 3: Cross multiply
   2,321.16x = 3,480.78 × 1,590.96
4. Step 4: Simplify right side
   2,321.16x = 5,537,781.75
5. Step 5: Solve for x
   x = 5,537,781.75/2,321.16
6. Step 6: Final answer
   x = 2,385.78