Finding the Fourth Proportional to 9,629.76, 13,288.61 and 5,380.76

Step by Step Solution

1. Step 1: Write the proportion equation
   9,629.76 : 13,288.61 = 5,380.76 : x
2. Step 2: Convert to fraction form
   9,629.76/13,288.61 = 5,380.76/x
3. Step 3: Cross multiply
   9,629.76x = 13,288.61 × 5,380.76
4. Step 4: Simplify right side
   9,629.76x = 71,502,867.82
5. Step 5: Solve for x
   x = 71,502,867.82/9,629.76
6. Step 6: Final answer
   x = 7,425.20