Finding the Third Proportional to 64,288.69 and 71,464.78

Step by Step Solution

1. Step 1: Write the proportion equation
   64,288.69 : 71,464.78 = 71,464.78 : x
2. Step 2: Convert to fraction form
   64,288.69/71,464.78 = 71,464.78/x
3. Step 3: Cross multiply
   64,288.69x = 71,464.78 × 71,464.78
4. Step 4: Simplify right side
   64,288.69x = 5,107,214,959.11
5. Step 5: Solve for x
   x = 5,107,214,959.11/64,288.69
6. Step 6: Final answer
   x = 79,441.89