Finding the Fourth Proportional to 1,231.89, 1,700.24 and 800.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,231.89 : 1,700.24 = 800.84 : x
2. Step 2: Convert to fraction form
   1,231.89/1,700.24 = 800.84/x
3. Step 3: Cross multiply
   1,231.89x = 1,700.24 × 800.84
4. Step 4: Simplify right side
   1,231.89x = 1,361,607.70
5. Step 5: Solve for x
   x = 1,361,607.70/1,231.89
6. Step 6: Final answer
   x = 1,105.30