Finding the Fourth Proportional to 1,422.52, 1,962.85 and 891.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,422.52 : 1,962.85 = 891.15 : x
2. Step 2: Convert to fraction form
   1,422.52/1,962.85 = 891.15/x
3. Step 3: Cross multiply
   1,422.52x = 1,962.85 × 891.15
4. Step 4: Simplify right side
   1,422.52x = 1,749,193.78
5. Step 5: Solve for x
   x = 1,749,193.78/1,422.52
6. Step 6: Final answer
   x = 1,229.64