Finding the Fourth Proportional to 1,100.57, 1,520.71 and 866.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.57 : 1,520.71 = 866.39 : x
2. Step 2: Convert to fraction form
   1,100.57/1,520.71 = 866.39/x
3. Step 3: Cross multiply
   1,100.57x = 1,520.71 × 866.39
4. Step 4: Simplify right side
   1,100.57x = 1,317,529.57
5. Step 5: Solve for x
   x = 1,317,529.57/1,100.57
6. Step 6: Final answer
   x = 1,197.13