Finding the Fourth Proportional to 1,356.50, 1,872.16 and 891.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,356.50 : 1,872.16 = 891.02 : x
2. Step 2: Convert to fraction form
   1,356.50/1,872.16 = 891.02/x
3. Step 3: Cross multiply
   1,356.50x = 1,872.16 × 891.02
4. Step 4: Simplify right side
   1,356.50x = 1,668,132.00
5. Step 5: Solve for x
   x = 1,668,132.00/1,356.50
6. Step 6: Final answer
   x = 1,229.73