Finding the Fourth Proportional to 1,422.33, 1,962.95 and 891.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,422.33 : 1,962.95 = 891.30 : x
2. Step 2: Convert to fraction form
   1,422.33/1,962.95 = 891.30/x
3. Step 3: Cross multiply
   1,422.33x = 1,962.95 × 891.30
4. Step 4: Simplify right side
   1,422.33x = 1,749,569.07
5. Step 5: Solve for x
   x = 1,749,569.07/1,422.33
6. Step 6: Final answer
   x = 1,230.07