Finding the Fourth Proportional to 2,810.47, 4,215.54 and 862.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,810.47 : 4,215.54 = 862.67 : x
2. Step 2: Convert to fraction form
   2,810.47/4,215.54 = 862.67/x
3. Step 3: Cross multiply
   2,810.47x = 4,215.54 × 862.67
4. Step 4: Simplify right side
   2,810.47x = 3,636,619.89
5. Step 5: Solve for x
   x = 3,636,619.89/2,810.47
6. Step 6: Final answer
   x = 1,293.95