Finding the Fourth Proportional to 3,906.54, 5,390.80 and 2,227.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,906.54 : 5,390.80 = 2,227.72 : x
2. Step 2: Convert to fraction form
   3,906.54/5,390.80 = 2,227.72/x
3. Step 3: Cross multiply
   3,906.54x = 5,390.80 × 2,227.72
4. Step 4: Simplify right side
   3,906.54x = 12,009,192.98
5. Step 5: Solve for x
   x = 12,009,192.98/3,906.54
6. Step 6: Final answer
   x = 3,074.13