Finding the Fourth Proportional to 1,123.75, 1,684.48 and 712.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.75 : 1,684.48 = 712.09 : x
2. Step 2: Convert to fraction form
   1,123.75/1,684.48 = 712.09/x
3. Step 3: Cross multiply
   1,123.75x = 1,684.48 × 712.09
4. Step 4: Simplify right side
   1,123.75x = 1,199,501.36
5. Step 5: Solve for x
   x = 1,199,501.36/1,123.75
6. Step 6: Final answer
   x = 1,067.41