Finding the Fourth Proportional to 13,920.48, 19,209.72 and 7,632.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,920.48 : 19,209.72 = 7,632.72 : x
2. Step 2: Convert to fraction form
   13,920.48/19,209.72 = 7,632.72/x
3. Step 3: Cross multiply
   13,920.48x = 19,209.72 × 7,632.72
4. Step 4: Simplify right side
   13,920.48x = 146,622,414.04
5. Step 5: Solve for x
   x = 146,622,414.04/13,920.48
6. Step 6: Final answer
   x = 10,532.86