Finding the Fourth Proportional to 13,933.72, 19,229.76 and 7,647.40

Step by Step Solution

1. Step 1: Write the proportion equation
   13,933.72 : 19,229.76 = 7,647.40 : x
2. Step 2: Convert to fraction form
   13,933.72/19,229.76 = 7,647.40/x
3. Step 3: Cross multiply
   13,933.72x = 19,229.76 × 7,647.40
4. Step 4: Simplify right side
   13,933.72x = 147,057,666.62
5. Step 5: Solve for x
   x = 147,057,666.62/13,933.72
6. Step 6: Final answer
   x = 10,554.09