Finding the Fourth Proportional to 3,980.31, 5,492.81 and 2,211.99

Step by Step Solution

1. Step 1: Write the proportion equation
   3,980.31 : 5,492.81 = 2,211.99 : x
2. Step 2: Convert to fraction form
   3,980.31/5,492.81 = 2,211.99/x
3. Step 3: Cross multiply
   3,980.31x = 5,492.81 × 2,211.99
4. Step 4: Simplify right side
   3,980.31x = 12,150,040.79
5. Step 5: Solve for x
   x = 12,150,040.79/3,980.31
6. Step 6: Final answer
   x = 3,052.54