Finding the Fourth Proportional to 1,139.94, 1,571.50 and 808.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.94 : 1,571.50 = 808.25 : x
2. Step 2: Convert to fraction form
   1,139.94/1,571.50 = 808.25/x
3. Step 3: Cross multiply
   1,139.94x = 1,571.50 × 808.25
4. Step 4: Simplify right side
   1,139.94x = 1,270,158.03
5. Step 5: Solve for x
   x = 1,270,158.03/1,139.94
6. Step 6: Final answer
   x = 1,114.23