Finding the Fourth Proportional to 1,422.31, 1,962.68 and 863.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,422.31 : 1,962.68 = 863.56 : x
2. Step 2: Convert to fraction form
   1,422.31/1,962.68 = 863.56/x
3. Step 3: Cross multiply
   1,422.31x = 1,962.68 × 863.56
4. Step 4: Simplify right side
   1,422.31x = 1,694,894.93
5. Step 5: Solve for x
   x = 1,694,894.93/1,422.31
6. Step 6: Final answer
   x = 1,191.65