Finding the Fourth Proportional to 8,471.48, 11,686.72 and 5,488.28

Step by Step Solution

1. Step 1: Write the proportion equation
   8,471.48 : 11,686.72 = 5,488.28 : x
2. Step 2: Convert to fraction form
   8,471.48/11,686.72 = 5,488.28/x
3. Step 3: Cross multiply
   8,471.48x = 11,686.72 × 5,488.28
4. Step 4: Simplify right side
   8,471.48x = 64,139,991.64
5. Step 5: Solve for x
   x = 64,139,991.64/8,471.48
6. Step 6: Final answer
   x = 7,571.29