Finding the Fourth Proportional to 3,906.16, 5,819.79 and 3,720.40

Step by Step Solution

1. Step 1: Write the proportion equation
   3,906.16 : 5,819.79 = 3,720.40 : x
2. Step 2: Convert to fraction form
   3,906.16/5,819.79 = 3,720.40/x
3. Step 3: Cross multiply
   3,906.16x = 5,819.79 × 3,720.40
4. Step 4: Simplify right side
   3,906.16x = 21,651,946.72
5. Step 5: Solve for x
   x = 21,651,946.72/3,906.16
6. Step 6: Final answer
   x = 5,543.03