Finding the Fourth Proportional to 1,422.87, 1,962.57 and 862.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,422.87 : 1,962.57 = 862.38 : x
2. Step 2: Convert to fraction form
   1,422.87/1,962.57 = 862.38/x
3. Step 3: Cross multiply
   1,422.87x = 1,962.57 × 862.38
4. Step 4: Simplify right side
   1,422.87x = 1,692,481.12
5. Step 5: Solve for x
   x = 1,692,481.12/1,422.87
6. Step 6: Final answer
   x = 1,189.48