Finding the Fourth Proportional to 8,321.72, 11,499.18 and 7,916.76

Step by Step Solution

1. Step 1: Write the proportion equation
   8,321.72 : 11,499.18 = 7,916.76 : x
2. Step 2: Convert to fraction form
   8,321.72/11,499.18 = 7,916.76/x
3. Step 3: Cross multiply
   8,321.72x = 11,499.18 × 7,916.76
4. Step 4: Simplify right side
   8,321.72x = 91,036,248.26
5. Step 5: Solve for x
   x = 91,036,248.26/8,321.72
6. Step 6: Final answer
   x = 10,939.60