Finding the Third Proportional to 30,684 and 64,440

Step by Step Solution

1. Step 1: Write the proportion equation
   30,684 : 64,440 = 64,440 : x
2. Step 2: Convert to fraction form
   30,684/64,440 = 64,440/x
3. Step 3: Cross multiply
   30,684x = 64,440 × 64,440
4. Step 4: Simplify right side
   30,684x = 4,152,513,600
5. Step 5: Solve for x
   x = 4,152,513,600/30,684
6. Step 6: Final answer
   x = 135,331.56