Finding the Fourth Proportional to 1,123.29, 1,550.69 and 870.66

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.29 : 1,550.69 = 870.66 : x
2. Step 2: Convert to fraction form
   1,123.29/1,550.69 = 870.66/x
3. Step 3: Cross multiply
   1,123.29x = 1,550.69 × 870.66
4. Step 4: Simplify right side
   1,123.29x = 1,350,127.56
5. Step 5: Solve for x
   x = 1,350,127.56/1,123.29
6. Step 6: Final answer
   x = 1,201.94