Finding the Fourth Proportional to 9,306.72, 12,843.36 and 5,115

Step by Step Solution

1. Step 1: Write the proportion equation
   9,306.72 : 12,843.36 = 5,115 : x
2. Step 2: Convert to fraction form
   9,306.72/12,843.36 = 5,115/x
3. Step 3: Cross multiply
   9,306.72x = 12,843.36 × 5,115
4. Step 4: Simplify right side
   9,306.72x = 65,693,786.40
5. Step 5: Solve for x
   x = 65,693,786.40/9,306.72
6. Step 6: Final answer
   x = 7,058.75