Finding the Fourth Proportional to 1,438.53, 1,985.37 and 809.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,438.53 : 1,985.37 = 809.31 : x
2. Step 2: Convert to fraction form
   1,438.53/1,985.37 = 809.31/x
3. Step 3: Cross multiply
   1,438.53x = 1,985.37 × 809.31
4. Step 4: Simplify right side
   1,438.53x = 1,606,775.75
5. Step 5: Solve for x
   x = 1,606,775.75/1,438.53
6. Step 6: Final answer
   x = 1,116.96