Finding the Fourth Proportional to 3,980.07, 5,492.57 and 2,187.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,980.07 : 5,492.57 = 2,187.72 : x
2. Step 2: Convert to fraction form
   3,980.07/5,492.57 = 2,187.72/x
3. Step 3: Cross multiply
   3,980.07x = 5,492.57 × 2,187.72
4. Step 4: Simplify right side
   3,980.07x = 12,016,194.30
5. Step 5: Solve for x
   x = 12,016,194.30/3,980.07
6. Step 6: Final answer
   x = 3,019.09