Finding the Fourth Proportional to 2,707.49, 4,061.18 and 858.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,707.49 : 4,061.18 = 858.72 : x
2. Step 2: Convert to fraction form
   2,707.49/4,061.18 = 858.72/x
3. Step 3: Cross multiply
   2,707.49x = 4,061.18 × 858.72
4. Step 4: Simplify right side
   2,707.49x = 3,487,412.20
5. Step 5: Solve for x
   x = 3,487,412.20/2,707.49
6. Step 6: Final answer
   x = 1,288.06