Finding the Fourth Proportional to 2,217.80, 3,060.52 and 1,223.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,217.80 : 3,060.52 = 1,223.17 : x
2. Step 2: Convert to fraction form
   2,217.80/3,060.52 = 1,223.17/x
3. Step 3: Cross multiply
   2,217.80x = 3,060.52 × 1,223.17
4. Step 4: Simplify right side
   2,217.80x = 3,743,541.60
5. Step 5: Solve for x
   x = 3,743,541.60/2,217.80
6. Step 6: Final answer
   x = 1,687.95