Finding the Fourth Proportional to 1,422.87, 1,963.69 and 863.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,422.87 : 1,963.69 = 863.48 : x
2. Step 2: Convert to fraction form
   1,422.87/1,963.69 = 863.48/x
3. Step 3: Cross multiply
   1,422.87x = 1,963.69 × 863.48
4. Step 4: Simplify right side
   1,422.87x = 1,695,607.04
5. Step 5: Solve for x
   x = 1,695,607.04/1,422.87
6. Step 6: Final answer
   x = 1,191.68