Finding the Fourth Proportional to 3,981.72, 5,494.71 and 2,213.28

Step by Step Solution

1. Step 1: Write the proportion equation
   3,981.72 : 5,494.71 = 2,213.28 : x
2. Step 2: Convert to fraction form
   3,981.72/5,494.71 = 2,213.28/x
3. Step 3: Cross multiply
   3,981.72x = 5,494.71 × 2,213.28
4. Step 4: Simplify right side
   3,981.72x = 12,161,331.75
5. Step 5: Solve for x
   x = 12,161,331.75/3,981.72
6. Step 6: Final answer
   x = 3,054.29