Finding the Third Proportional to 30,650 and 64,390

Step by Step Solution

1. Step 1: Write the proportion equation
   30,650 : 64,390 = 64,390 : x
2. Step 2: Convert to fraction form
   30,650/64,390 = 64,390/x
3. Step 3: Cross multiply
   30,650x = 64,390 × 64,390
4. Step 4: Simplify right side
   30,650x = 4,146,072,100
5. Step 5: Solve for x
   x = 4,146,072,100/30,650
6. Step 6: Final answer
   x = 135,271.52