Finding the Fourth Proportional to 2,707.31, 4,061.08 and 858.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,707.31 : 4,061.08 = 858.39 : x
2. Step 2: Convert to fraction form
   2,707.31/4,061.08 = 858.39/x
3. Step 3: Cross multiply
   2,707.31x = 4,061.08 × 858.39
4. Step 4: Simplify right side
   2,707.31x = 3,485,990.46
5. Step 5: Solve for x
   x = 3,485,990.46/2,707.31
6. Step 6: Final answer
   x = 1,287.62