Finding the Fourth Proportional to 2,891.59, 3,990.38 and 1,565.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,891.59 : 3,990.38 = 1,565.31 : x
2. Step 2: Convert to fraction form
   2,891.59/3,990.38 = 1,565.31/x
3. Step 3: Cross multiply
   2,891.59x = 3,990.38 × 1,565.31
4. Step 4: Simplify right side
   2,891.59x = 6,246,181.72
5. Step 5: Solve for x
   x = 6,246,181.72/2,891.59
6. Step 6: Final answer
   x = 2,160.12