Finding the Fourth Proportional to 3,961.72, 5,942.61 and 3,721.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,961.72 : 5,942.61 = 3,721.15 : x
2. Step 2: Convert to fraction form
   3,961.72/5,942.61 = 3,721.15/x
3. Step 3: Cross multiply
   3,961.72x = 5,942.61 × 3,721.15
4. Step 4: Simplify right side
   3,961.72x = 22,113,343.20
5. Step 5: Solve for x
   x = 22,113,343.20/3,961.72
6. Step 6: Final answer
   x = 5,581.75