Finding the Fourth Proportional to 3,979.72, 5,940.37 and 3,686.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,979.72 : 5,940.37 = 3,686.50 : x
2. Step 2: Convert to fraction form
   3,979.72/5,940.37 = 3,686.50/x
3. Step 3: Cross multiply
   3,979.72x = 5,940.37 × 3,686.50
4. Step 4: Simplify right side
   3,979.72x = 21,899,174.01
5. Step 5: Solve for x
   x = 21,899,174.01/3,979.72
6. Step 6: Final answer
   x = 5,502.69