Finding the Fourth Proportional to 3,679.20, 5,517.18 and 1,081.62

Step by Step Solution

1. Step 1: Write the proportion equation
   3,679.20 : 5,517.18 = 1,081.62 : x
2. Step 2: Convert to fraction form
   3,679.20/5,517.18 = 1,081.62/x
3. Step 3: Cross multiply
   3,679.20x = 5,517.18 × 1,081.62
4. Step 4: Simplify right side
   3,679.20x = 5,967,492.23
5. Step 5: Solve for x
   x = 5,967,492.23/3,679.20
6. Step 6: Final answer
   x = 1,621.95