Finding the Fourth Proportional to 1,565.52, 2,160.42 and 857.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,565.52 : 2,160.42 = 857.37 : x
2. Step 2: Convert to fraction form
   1,565.52/2,160.42 = 857.37/x
3. Step 3: Cross multiply
   1,565.52x = 2,160.42 × 857.37
4. Step 4: Simplify right side
   1,565.52x = 1,852,279.30
5. Step 5: Solve for x
   x = 1,852,279.30/1,565.52
6. Step 6: Final answer
   x = 1,183.17