Finding the Fourth Proportional to 5,599.72, 7,727.55 and 3,920.51

Step by Step Solution

1. Step 1: Write the proportion equation
   5,599.72 : 7,727.55 = 3,920.51 : x
2. Step 2: Convert to fraction form
   5,599.72/7,727.55 = 3,920.51/x
3. Step 3: Cross multiply
   5,599.72x = 7,727.55 × 3,920.51
4. Step 4: Simplify right side
   5,599.72x = 30,295,974.59
5. Step 5: Solve for x
   x = 30,295,974.59/5,599.72
6. Step 6: Final answer
   x = 5,410.27