Finding the Fourth Proportional to 1,436.80, 2,152.96 and 922.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,436.80 : 2,152.96 = 922.72 : x
2. Step 2: Convert to fraction form
   1,436.80/2,152.96 = 922.72/x
3. Step 3: Cross multiply
   1,436.80x = 2,152.96 × 922.72
4. Step 4: Simplify right side
   1,436.80x = 1,986,579.25
5. Step 5: Solve for x
   x = 1,986,579.25/1,436.80
6. Step 6: Final answer
   x = 1,382.64