Finding the Fourth Proportional to 3,980.30, 5,492.82 and 2,211.86

Step by Step Solution

1. Step 1: Write the proportion equation
   3,980.30 : 5,492.82 = 2,211.86 : x
2. Step 2: Convert to fraction form
   3,980.30/5,492.82 = 2,211.86/x
3. Step 3: Cross multiply
   3,980.30x = 5,492.82 × 2,211.86
4. Step 4: Simplify right side
   3,980.30x = 12,149,348.85
5. Step 5: Solve for x
   x = 12,149,348.85/3,980.30
6. Step 6: Final answer
   x = 3,052.37