Finding the Fourth Proportional to 1,438.52, 1,985.13 and 809.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,438.52 : 1,985.13 = 809.03 : x
2. Step 2: Convert to fraction form
   1,438.52/1,985.13 = 809.03/x
3. Step 3: Cross multiply
   1,438.52x = 1,985.13 × 809.03
4. Step 4: Simplify right side
   1,438.52x = 1,606,019.80
5. Step 5: Solve for x
   x = 1,606,019.80/1,438.52
6. Step 6: Final answer
   x = 1,116.44