Finding the Fourth Proportional to 2,231.76, 3,079.88 and 1,223.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,231.76 : 3,079.88 = 1,223.52 : x
2. Step 2: Convert to fraction form
   2,231.76/3,079.88 = 1,223.52/x
3. Step 3: Cross multiply
   2,231.76x = 3,079.88 × 1,223.52
4. Step 4: Simplify right side
   2,231.76x = 3,768,294.78
5. Step 5: Solve for x
   x = 3,768,294.78/2,231.76
6. Step 6: Final answer
   x = 1,688.49