Finding the Fourth Proportional to 1,238.94, 1,708.83 and 866.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,238.94 : 1,708.83 = 866.34 : x
2. Step 2: Convert to fraction form
   1,238.94/1,708.83 = 866.34/x
3. Step 3: Cross multiply
   1,238.94x = 1,708.83 × 866.34
4. Step 4: Simplify right side
   1,238.94x = 1,480,427.78
5. Step 5: Solve for x
   x = 1,480,427.78/1,238.94
6. Step 6: Final answer
   x = 1,194.91