Finding the Fourth Proportional to 1,436.85, 1,982.40 and 807.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,436.85 : 1,982.40 = 807.30 : x
2. Step 2: Convert to fraction form
   1,436.85/1,982.40 = 807.30/x
3. Step 3: Cross multiply
   1,436.85x = 1,982.40 × 807.30
4. Step 4: Simplify right side
   1,436.85x = 1,600,391.52
5. Step 5: Solve for x
   x = 1,600,391.52/1,436.85
6. Step 6: Final answer
   x = 1,113.82