Finding the Fourth Proportional to 1,931.75, 2,665.91 and 1,223.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,931.75 : 2,665.91 = 1,223.33 : x
2. Step 2: Convert to fraction form
   1,931.75/2,665.91 = 1,223.33/x
3. Step 3: Cross multiply
   1,931.75x = 2,665.91 × 1,223.33
4. Step 4: Simplify right side
   1,931.75x = 3,261,268.23
5. Step 5: Solve for x
   x = 3,261,268.23/1,931.75
6. Step 6: Final answer
   x = 1,688.25