Finding the Third Proportional to 7,645.78 and 11,816.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,645.78 : 11,816.72 = 11,816.72 : x
2. Step 2: Convert to fraction form
   7,645.78/11,816.72 = 11,816.72/x
3. Step 3: Cross multiply
   7,645.78x = 11,816.72 × 11,816.72
4. Step 4: Simplify right side
   7,645.78x = 139,634,842.02
5. Step 5: Solve for x
   x = 139,634,842.02/7,645.78
6. Step 6: Final answer
   x = 18,262.99