Finding the Fourth Proportional to 9,328.56, 12,873.24 and 5,136.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,328.56 : 12,873.24 = 5,136.72 : x
2. Step 2: Convert to fraction form
   9,328.56/12,873.24 = 5,136.72/x
3. Step 3: Cross multiply
   9,328.56x = 12,873.24 × 5,136.72
4. Step 4: Simplify right side
   9,328.56x = 66,126,229.37
5. Step 5: Solve for x
   x = 66,126,229.37/9,328.56
6. Step 6: Final answer
   x = 7,088.58