Finding the Fourth Proportional to 3,720, 5,134.24 and 2,478.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,720 : 5,134.24 = 2,478.72 : x
2. Step 2: Convert to fraction form
   3,720/5,134.24 = 2,478.72/x
3. Step 3: Cross multiply
   3,720x = 5,134.24 × 2,478.72
4. Step 4: Simplify right side
   3,720x = 12,726,343.37
5. Step 5: Solve for x
   x = 12,726,343.37/3,720
6. Step 6: Final answer
   x = 3,421.06