Finding the Fourth Proportional to 9,328.72, 12,873.72 and 5,137.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,328.72 : 12,873.72 = 5,137.12 : x
2. Step 2: Convert to fraction form
   9,328.72/12,873.72 = 5,137.12/x
3. Step 3: Cross multiply
   9,328.72x = 12,873.72 × 5,137.12
4. Step 4: Simplify right side
   9,328.72x = 66,133,844.49
5. Step 5: Solve for x
   x = 66,133,844.49/9,328.72
6. Step 6: Final answer
   x = 7,089.27