Finding the Fourth Proportional to 1,147.46, 1,722.42 and 860.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,147.46 : 1,722.42 = 860.72 : x
2. Step 2: Convert to fraction form
   1,147.46/1,722.42 = 860.72/x
3. Step 3: Cross multiply
   1,147.46x = 1,722.42 × 860.72
4. Step 4: Simplify right side
   1,147.46x = 1,482,512.73
5. Step 5: Solve for x
   x = 1,482,512.73/1,147.46
6. Step 6: Final answer
   x = 1,292.00