Finding the Fourth Proportional to 3,686.72, 5,530.20 and 1,378.16

Step by Step Solution

1. Step 1: Write the proportion equation
   3,686.72 : 5,530.20 = 1,378.16 : x
2. Step 2: Convert to fraction form
   3,686.72/5,530.20 = 1,378.16/x
3. Step 3: Cross multiply
   3,686.72x = 5,530.20 × 1,378.16
4. Step 4: Simplify right side
   3,686.72x = 7,621,500.43
5. Step 5: Solve for x
   x = 7,621,500.43/3,686.72
6. Step 6: Final answer
   x = 2,067.28