Finding the Fourth Proportional to 3,992.16, 5,509.16 and 2,223.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,992.16 : 5,509.16 = 2,223.72 : x
2. Step 2: Convert to fraction form
   3,992.16/5,509.16 = 2,223.72/x
3. Step 3: Cross multiply
   3,992.16x = 5,509.16 × 2,223.72
4. Step 4: Simplify right side
   3,992.16x = 12,250,829.28
5. Step 5: Solve for x
   x = 12,250,829.28/3,992.16
6. Step 6: Final answer
   x = 3,068.72