Finding the Fourth Proportional to 1,565.33, 2,160.17 and 857.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,565.33 : 2,160.17 = 857.15 : x
2. Step 2: Convert to fraction form
   1,565.33/2,160.17 = 857.15/x
3. Step 3: Cross multiply
   1,565.33x = 2,160.17 × 857.15
4. Step 4: Simplify right side
   1,565.33x = 1,851,574.63
5. Step 5: Solve for x
   x = 1,851,574.63/1,565.33
6. Step 6: Final answer
   x = 1,182.87