Finding the Fourth Proportional to 1,422.16, 1,962.66 and 862.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,422.16 : 1,962.66 = 862.72 : x
2. Step 2: Convert to fraction form
   1,422.16/1,962.66 = 862.72/x
3. Step 3: Cross multiply
   1,422.16x = 1,962.66 × 862.72
4. Step 4: Simplify right side
   1,422.16x = 1,693,226.04
5. Step 5: Solve for x
   x = 1,693,226.04/1,422.16
6. Step 6: Final answer
   x = 1,190.60