Finding the Fourth Proportional to 1,921.92, 2,643.39 and 1,565.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,921.92 : 2,643.39 = 1,565.31 : x
2. Step 2: Convert to fraction form
   1,921.92/2,643.39 = 1,565.31/x
3. Step 3: Cross multiply
   1,921.92x = 2,643.39 × 1,565.31
4. Step 4: Simplify right side
   1,921.92x = 4,137,724.80
5. Step 5: Solve for x
   x = 4,137,724.80/1,921.92
6. Step 6: Final answer
   x = 2,152.91