Finding the Fourth Proportional to 3,686.56, 5,529.72 and 913.24

Step by Step Solution

1. Step 1: Write the proportion equation
   3,686.56 : 5,529.72 = 913.24 : x
2. Step 2: Convert to fraction form
   3,686.56/5,529.72 = 913.24/x
3. Step 3: Cross multiply
   3,686.56x = 5,529.72 × 913.24
4. Step 4: Simplify right side
   3,686.56x = 5,049,961.49
5. Step 5: Solve for x
   x = 5,049,961.49/3,686.56
6. Step 6: Final answer
   x = 1,369.83