Finding the Fourth Proportional to 3,728.06, 5,180.40 and 3,687.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,728.06 : 5,180.40 = 3,687.56 : x
2. Step 2: Convert to fraction form
   3,728.06/5,180.40 = 3,687.56/x
3. Step 3: Cross multiply
   3,728.06x = 5,180.40 × 3,687.56
4. Step 4: Simplify right side
   3,728.06x = 19,103,035.82
5. Step 5: Solve for x
   x = 19,103,035.82/3,728.06
6. Step 6: Final answer
   x = 5,124.12