Finding the Fourth Proportional to 2,231.81, 3,079.71 and 1,223.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,231.81 : 3,079.71 = 1,223.50 : x
2. Step 2: Convert to fraction form
   2,231.81/3,079.71 = 1,223.50/x
3. Step 3: Cross multiply
   2,231.81x = 3,079.71 × 1,223.50
4. Step 4: Simplify right side
   2,231.81x = 3,768,012.85
5. Step 5: Solve for x
   x = 3,768,012.85/2,231.81
6. Step 6: Final answer
   x = 1,688.33