Finding the Fourth Proportional to 1,449.72, 2,000.61 and 860.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,449.72 : 2,000.61 = 860.31 : x
2. Step 2: Convert to fraction form
   1,449.72/2,000.61 = 860.31/x
3. Step 3: Cross multiply
   1,449.72x = 2,000.61 × 860.31
4. Step 4: Simplify right side
   1,449.72x = 1,721,144.79
5. Step 5: Solve for x
   x = 1,721,144.79/1,449.72
6. Step 6: Final answer
   x = 1,187.23