Finding the Fourth Proportional to 3,980.04, 5,492.42 and 2,211.60

Step by Step Solution

1. Step 1: Write the proportion equation
   3,980.04 : 5,492.42 = 2,211.60 : x
2. Step 2: Convert to fraction form
   3,980.04/5,492.42 = 2,211.60/x
3. Step 3: Cross multiply
   3,980.04x = 5,492.42 × 2,211.60
4. Step 4: Simplify right side
   3,980.04x = 12,147,036.07
5. Step 5: Solve for x
   x = 12,147,036.07/3,980.04
6. Step 6: Final answer
   x = 3,051.99