Finding the Fourth Proportional to 1,308.83, 1,805.94 and 866.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,308.83 : 1,805.94 = 866.57 : x
2. Step 2: Convert to fraction form
   1,308.83/1,805.94 = 866.57/x
3. Step 3: Cross multiply
   1,308.83x = 1,805.94 × 866.57
4. Step 4: Simplify right side
   1,308.83x = 1,564,964.40
5. Step 5: Solve for x
   x = 1,564,964.40/1,308.83
6. Step 6: Final answer
   x = 1,195.70