Finding the Fourth Proportional to 2,223.76, 3,315.37 and 2,166.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,223.76 : 3,315.37 = 2,166.96 : x
2. Step 2: Convert to fraction form
   2,223.76/3,315.37 = 2,166.96/x
3. Step 3: Cross multiply
   2,223.76x = 3,315.37 × 2,166.96
4. Step 4: Simplify right side
   2,223.76x = 7,184,257.60
5. Step 5: Solve for x
   x = 7,184,257.60/2,223.76
6. Step 6: Final answer
   x = 3,230.68