Finding the Fourth Proportional to 1,016.12, 1,399.13 and 866.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.12 : 1,399.13 = 866.42 : x
2. Step 2: Convert to fraction form
   1,016.12/1,399.13 = 866.42/x
3. Step 3: Cross multiply
   1,016.12x = 1,399.13 × 866.42
4. Step 4: Simplify right side
   1,016.12x = 1,212,222.89
5. Step 5: Solve for x
   x = 1,212,222.89/1,016.12
6. Step 6: Final answer
   x = 1,192.99