Finding the Fourth Proportional to 3,909.53, 5,360.51 and 3,860.33

Step by Step Solution

1. Step 1: Write the proportion equation
   3,909.53 : 5,360.51 = 3,860.33 : x
2. Step 2: Convert to fraction form
   3,909.53/5,360.51 = 3,860.33/x
3. Step 3: Cross multiply
   3,909.53x = 5,360.51 × 3,860.33
4. Step 4: Simplify right side
   3,909.53x = 20,693,320.42
5. Step 5: Solve for x
   x = 20,693,320.42/3,909.53
6. Step 6: Final answer
   x = 5,293.04