Finding the Third Proportional to 30,280 and 64,912

Step by Step Solution

1. Step 1: Write the proportion equation
   30,280 : 64,912 = 64,912 : x
2. Step 2: Convert to fraction form
   30,280/64,912 = 64,912/x
3. Step 3: Cross multiply
   30,280x = 64,912 × 64,912
4. Step 4: Simplify right side
   30,280x = 4,213,567,744
5. Step 5: Solve for x
   x = 4,213,567,744/30,280
6. Step 6: Final answer
   x = 139,153.49