Finding the Fourth Proportional to 3,979.99, 5,492.15 and 2,211.54

Step by Step Solution

1. Step 1: Write the proportion equation
   3,979.99 : 5,492.15 = 2,211.54 : x
2. Step 2: Convert to fraction form
   3,979.99/5,492.15 = 2,211.54/x
3. Step 3: Cross multiply
   3,979.99x = 5,492.15 × 2,211.54
4. Step 4: Simplify right side
   3,979.99x = 12,146,070.89
5. Step 5: Solve for x
   x = 12,146,070.89/3,979.99
6. Step 6: Final answer
   x = 3,051.78