Finding the Fourth Proportional to 1,231.89, 1,845.79 and 866.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,231.89 : 1,845.79 = 866.03 : x
2. Step 2: Convert to fraction form
   1,231.89/1,845.79 = 866.03/x
3. Step 3: Cross multiply
   1,231.89x = 1,845.79 × 866.03
4. Step 4: Simplify right side
   1,231.89x = 1,598,498.12
5. Step 5: Solve for x
   x = 1,598,498.12/1,231.89
6. Step 6: Final answer
   x = 1,297.60