Finding the Fourth Proportional to 8,505.20, 12,762.72 and 3,574.40

Step by Step Solution

1. Step 1: Write the proportion equation
   8,505.20 : 12,762.72 = 3,574.40 : x
2. Step 2: Convert to fraction form
   8,505.20/12,762.72 = 3,574.40/x
3. Step 3: Cross multiply
   8,505.20x = 12,762.72 × 3,574.40
4. Step 4: Simplify right side
   8,505.20x = 45,619,066.37
5. Step 5: Solve for x
   x = 45,619,066.37/8,505.20
6. Step 6: Final answer
   x = 5,363.67