Finding the Fourth Proportional to 1,446.89, 2,164.95 and 862.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,446.89 : 2,164.95 = 862.20 : x
2. Step 2: Convert to fraction form
   1,446.89/2,164.95 = 862.20/x
3. Step 3: Cross multiply
   1,446.89x = 2,164.95 × 862.20
4. Step 4: Simplify right side
   1,446.89x = 1,866,619.89
5. Step 5: Solve for x
   x = 1,866,619.89/1,446.89
6. Step 6: Final answer
   x = 1,290.10