Finding the Fourth Proportional to 1,123.97, 1,683.72 and 879.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.97 : 1,683.72 = 879.35 : x
2. Step 2: Convert to fraction form
   1,123.97/1,683.72 = 879.35/x
3. Step 3: Cross multiply
   1,123.97x = 1,683.72 × 879.35
4. Step 4: Simplify right side
   1,123.97x = 1,480,566.37
5. Step 5: Solve for x
   x = 1,480,566.37/1,123.97
6. Step 6: Final answer
   x = 1,317.27