Finding the Fourth Proportional to 1,565.34, 2,160.17 and 866.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,565.34 : 2,160.17 = 866.72 : x
2. Step 2: Convert to fraction form
   1,565.34/2,160.17 = 866.72/x
3. Step 3: Cross multiply
   1,565.34x = 2,160.17 × 866.72
4. Step 4: Simplify right side
   1,565.34x = 1,872,263.63
5. Step 5: Solve for x
   x = 1,872,263.63/1,565.34
6. Step 6: Final answer
   x = 1,196.07