Finding the Third Proportional to 64,880 and 139,581

Step by Step Solution

1. Step 1: Write the proportion equation
   64,880 : 139,581 = 139,581 : x
2. Step 2: Convert to fraction form
   64,880/139,581 = 139,581/x
3. Step 3: Cross multiply
   64,880x = 139,581 × 139,581
4. Step 4: Simplify right side
   64,880x = 19,482,855,561
5. Step 5: Solve for x
   x = 19,482,855,561/64,880
6. Step 6: Final answer
   x = 300,290.62