Finding the Fourth Proportional to 3,981.12, 5,493.72 and 2,212.80

Step by Step Solution

1. Step 1: Write the proportion equation
   3,981.12 : 5,493.72 = 2,212.80 : x
2. Step 2: Convert to fraction form
   3,981.12/5,493.72 = 2,212.80/x
3. Step 3: Cross multiply
   3,981.12x = 5,493.72 × 2,212.80
4. Step 4: Simplify right side
   3,981.12x = 12,156,503.62
5. Step 5: Solve for x
   x = 12,156,503.62/3,981.12
6. Step 6: Final answer
   x = 3,053.54