Finding the Third Proportional to 5,108.91 and 7,811.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,108.91 : 7,811.72 = 7,811.72 : x
2. Step 2: Convert to fraction form
   5,108.91/7,811.72 = 7,811.72/x
3. Step 3: Cross multiply
   5,108.91x = 7,811.72 × 7,811.72
4. Step 4: Simplify right side
   5,108.91x = 61,022,949.83
5. Step 5: Solve for x
   x = 61,022,949.83/5,108.91
6. Step 6: Final answer
   x = 11,944.43