Finding the Third Proportional to 64,777 and 139,490

Step by Step Solution

1. Step 1: Write the proportion equation
   64,777 : 139,490 = 139,490 : x
2. Step 2: Convert to fraction form
   64,777/139,490 = 139,490/x
3. Step 3: Cross multiply
   64,777x = 139,490 × 139,490
4. Step 4: Simplify right side
   64,777x = 19,457,460,100
5. Step 5: Solve for x
   x = 19,457,460,100/64,777
6. Step 6: Final answer
   x = 300,376.06