Finding the Fourth Proportional to 3,719.28, 5,581.76 and 1,380.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,719.28 : 5,581.76 = 1,380.72 : x
2. Step 2: Convert to fraction form
   3,719.28/5,581.76 = 1,380.72/x
3. Step 3: Cross multiply
   3,719.28x = 5,581.76 × 1,380.72
4. Step 4: Simplify right side
   3,719.28x = 7,706,847.67
5. Step 5: Solve for x
   x = 7,706,847.67/3,719.28
6. Step 6: Final answer
   x = 2,072.13