Finding the Fourth Proportional to 13,935.20, 19,231.82 and 7,648.79

Step by Step Solution

1. Step 1: Write the proportion equation
   13,935.20 : 19,231.82 = 7,648.79 : x
2. Step 2: Convert to fraction form
   13,935.20/19,231.82 = 7,648.79/x
3. Step 3: Cross multiply
   13,935.20x = 19,231.82 × 7,648.79
4. Step 4: Simplify right side
   13,935.20x = 147,100,018.09
5. Step 5: Solve for x
   x = 147,100,018.09/13,935.20
6. Step 6: Final answer
   x = 10,556.01