Finding the Fourth Proportional to 3,849.36, 5,309.40 and 3,720.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,849.36 : 5,309.40 = 3,720.78 : x
2. Step 2: Convert to fraction form
   3,849.36/5,309.40 = 3,720.78/x
3. Step 3: Cross multiply
   3,849.36x = 5,309.40 × 3,720.78
4. Step 4: Simplify right side
   3,849.36x = 19,755,109.33
5. Step 5: Solve for x
   x = 19,755,109.33/3,849.36
6. Step 6: Final answer
   x = 5,132.05