Finding the Fourth Proportional to 3,859.54, 5,326.42 and 3,720.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,859.54 : 5,326.42 = 3,720.12 : x
2. Step 2: Convert to fraction form
   3,859.54/5,326.42 = 3,720.12/x
3. Step 3: Cross multiply
   3,859.54x = 5,326.42 × 3,720.12
4. Step 4: Simplify right side
   3,859.54x = 19,814,921.57
5. Step 5: Solve for x
   x = 19,814,921.57/3,859.54
6. Step 6: Final answer
   x = 5,134.01