Finding the Fourth Proportional to 3,979.98, 5,492.30 and 2,211.57

Step by Step Solution

1. Step 1: Write the proportion equation
   3,979.98 : 5,492.30 = 2,211.57 : x
2. Step 2: Convert to fraction form
   3,979.98/5,492.30 = 2,211.57/x
3. Step 3: Cross multiply
   3,979.98x = 5,492.30 × 2,211.57
4. Step 4: Simplify right side
   3,979.98x = 12,146,594.85
5. Step 5: Solve for x
   x = 12,146,594.85/3,979.98
6. Step 6: Final answer
   x = 3,051.92