Finding the Fourth Proportional to 2,810.59, 4,215.73 and 862.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,810.59 : 4,215.73 = 862.79 : x
2. Step 2: Convert to fraction form
   2,810.59/4,215.73 = 862.79/x
3. Step 3: Cross multiply
   2,810.59x = 4,215.73 × 862.79
4. Step 4: Simplify right side
   2,810.59x = 3,637,289.69
5. Step 5: Solve for x
   x = 3,637,289.69/2,810.59
6. Step 6: Final answer
   x = 1,294.14