Finding the Fourth Proportional to 1,411.60, 2,114.70 and 862.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,411.60 : 2,114.70 = 862.15 : x
2. Step 2: Convert to fraction form
   1,411.60/2,114.70 = 862.15/x
3. Step 3: Cross multiply
   1,411.60x = 2,114.70 × 862.15
4. Step 4: Simplify right side
   1,411.60x = 1,823,188.61
5. Step 5: Solve for x
   x = 1,823,188.61/1,411.60
6. Step 6: Final answer
   x = 1,291.58