Finding the Fourth Proportional to 8,328.56, 11,481.50 and 5,139.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,328.56 : 11,481.50 = 5,139.72 : x
2. Step 2: Convert to fraction form
   8,328.56/11,481.50 = 5,139.72/x
3. Step 3: Cross multiply
   8,328.56x = 11,481.50 × 5,139.72
4. Step 4: Simplify right side
   8,328.56x = 59,011,695.18
5. Step 5: Solve for x
   x = 59,011,695.18/8,328.56
6. Step 6: Final answer
   x = 7,085.46