Finding the Fourth Proportional to 3,996.18, 5,518.53 and 3,778.02

Step by Step Solution

1. Step 1: Write the proportion equation
   3,996.18 : 5,518.53 = 3,778.02 : x
2. Step 2: Convert to fraction form
   3,996.18/5,518.53 = 3,778.02/x
3. Step 3: Cross multiply
   3,996.18x = 5,518.53 × 3,778.02
4. Step 4: Simplify right side
   3,996.18x = 20,849,116.71
5. Step 5: Solve for x
   x = 20,849,116.71/3,996.18
6. Step 6: Final answer
   x = 5,217.26