Finding the Fourth Proportional to 13,007.72, 17,950.50 and 7,039.28

Step by Step Solution

1. Step 1: Write the proportion equation
   13,007.72 : 17,950.50 = 7,039.28 : x
2. Step 2: Convert to fraction form
   13,007.72/17,950.50 = 7,039.28/x
3. Step 3: Cross multiply
   13,007.72x = 17,950.50 × 7,039.28
4. Step 4: Simplify right side
   13,007.72x = 126,358,505.89
5. Step 5: Solve for x
   x = 126,358,505.89/13,007.72
6. Step 6: Final answer
   x = 9,714.12