Finding the Third Proportional to 64,676 and 91,290

Step by Step Solution

1. Step 1: Write the proportion equation
   64,676 : 91,290 = 91,290 : x
2. Step 2: Convert to fraction form
   64,676/91,290 = 91,290/x
3. Step 3: Cross multiply
   64,676x = 91,290 × 91,290
4. Step 4: Simplify right side
   64,676x = 8,333,864,100
5. Step 5: Solve for x
   x = 8,333,864,100/64,676
6. Step 6: Final answer
   x = 128,855.59