Finding the Fourth Proportional to 1,439.02, 1,985.67 and 809.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.02 : 1,985.67 = 809.41 : x
2. Step 2: Convert to fraction form
   1,439.02/1,985.67 = 809.41/x
3. Step 3: Cross multiply
   1,439.02x = 1,985.67 × 809.41
4. Step 4: Simplify right side
   1,439.02x = 1,607,221.15
5. Step 5: Solve for x
   x = 1,607,221.15/1,439.02
6. Step 6: Final answer
   x = 1,116.89