Finding the Fourth Proportional to 3,906.96, 5,388.30 and 3,518.16

Step by Step Solution

1. Step 1: Write the proportion equation
   3,906.96 : 5,388.30 = 3,518.16 : x
2. Step 2: Convert to fraction form
   3,906.96/5,388.30 = 3,518.16/x
3. Step 3: Cross multiply
   3,906.96x = 5,388.30 × 3,518.16
4. Step 4: Simplify right side
   3,906.96x = 18,956,901.53
5. Step 5: Solve for x
   x = 18,956,901.53/3,906.96
6. Step 6: Final answer
   x = 4,852.08