Finding the Fourth Proportional to 1,382.72, 1,907.94 and 885.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,382.72 : 1,907.94 = 885.80 : x
2. Step 2: Convert to fraction form
   1,382.72/1,907.94 = 885.80/x
3. Step 3: Cross multiply
   1,382.72x = 1,907.94 × 885.80
4. Step 4: Simplify right side
   1,382.72x = 1,690,053.25
5. Step 5: Solve for x
   x = 1,690,053.25/1,382.72
6. Step 6: Final answer
   x = 1,222.27