Finding the Fourth Proportional to 13,020.78, 17,968.59 and 7,052.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,020.78 : 17,968.59 = 7,052.31 : x
2. Step 2: Convert to fraction form
   13,020.78/17,968.59 = 7,052.31/x
3. Step 3: Cross multiply
   13,020.78x = 17,968.59 × 7,052.31
4. Step 4: Simplify right side
   13,020.78x = 126,720,066.94
5. Step 5: Solve for x
   x = 126,720,066.94/13,020.78
6. Step 6: Final answer
   x = 9,732.14