Finding the Fourth Proportional to 1,382.84, 1,907.50 and 885.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,382.84 : 1,907.50 = 885.30 : x
2. Step 2: Convert to fraction form
   1,382.84/1,907.50 = 885.30/x
3. Step 3: Cross multiply
   1,382.84x = 1,907.50 × 885.30
4. Step 4: Simplify right side
   1,382.84x = 1,688,702.04
5. Step 5: Solve for x
   x = 1,688,702.04/1,382.84
6. Step 6: Final answer
   x = 1,221.19