Finding the Fourth Proportional to 1,382.47, 1,908.16 and 885.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,382.47 : 1,908.16 = 885.53 : x
2. Step 2: Convert to fraction form
   1,382.47/1,908.16 = 885.53/x
3. Step 3: Cross multiply
   1,382.47x = 1,908.16 × 885.53
4. Step 4: Simplify right side
   1,382.47x = 1,689,735.48
5. Step 5: Solve for x
   x = 1,689,735.48/1,382.47
6. Step 6: Final answer
   x = 1,222.26