Finding the Fourth Proportional to 2,707.54, 4,061.42 and 858.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,707.54 : 4,061.42 = 858.72 : x
2. Step 2: Convert to fraction form
   2,707.54/4,061.42 = 858.72/x
3. Step 3: Cross multiply
   2,707.54x = 4,061.42 × 858.72
4. Step 4: Simplify right side
   2,707.54x = 3,487,636.74
5. Step 5: Solve for x
   x = 3,487,636.74/2,707.54
6. Step 6: Final answer
   x = 1,288.12