Finding the Fourth Proportional to 2,707.45, 4,061.15 and 858.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,707.45 : 4,061.15 = 858.52 : x
2. Step 2: Convert to fraction form
   2,707.45/4,061.15 = 858.52/x
3. Step 3: Cross multiply
   2,707.45x = 4,061.15 × 858.52
4. Step 4: Simplify right side
   2,707.45x = 3,486,579.81
5. Step 5: Solve for x
   x = 3,486,579.81/2,707.45
6. Step 6: Final answer
   x = 1,287.77