Finding the Fourth Proportional to 2,191.54, 3,287.34 and 1,223.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,191.54 : 3,287.34 = 1,223.80 : x
2. Step 2: Convert to fraction form
   2,191.54/3,287.34 = 1,223.80/x
3. Step 3: Cross multiply
   2,191.54x = 3,287.34 × 1,223.80
4. Step 4: Simplify right side
   2,191.54x = 4,023,046.69
5. Step 5: Solve for x
   x = 4,023,046.69/2,191.54
6. Step 6: Final answer
   x = 1,835.72