Finding the Fourth Proportional to 1,439.08, 1,985.37 and 809.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.08 : 1,985.37 = 809.46 : x
2. Step 2: Convert to fraction form
   1,439.08/1,985.37 = 809.46/x
3. Step 3: Cross multiply
   1,439.08x = 1,985.37 × 809.46
4. Step 4: Simplify right side
   1,439.08x = 1,607,073.55
5. Step 5: Solve for x
   x = 1,607,073.55/1,439.08
6. Step 6: Final answer
   x = 1,116.74