Finding the Fourth Proportional to 1,039.32, 1,566.02 and 860.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.32 : 1,566.02 = 860.72 : x
2. Step 2: Convert to fraction form
   1,039.32/1,566.02 = 860.72/x
3. Step 3: Cross multiply
   1,039.32x = 1,566.02 × 860.72
4. Step 4: Simplify right side
   1,039.32x = 1,347,904.73
5. Step 5: Solve for x
   x = 1,347,904.73/1,039.32
6. Step 6: Final answer
   x = 1,296.91