Finding the Third Proportional to 31,520 and 64,480

Step by Step Solution

1. Step 1: Write the proportion equation
   31,520 : 64,480 = 64,480 : x
2. Step 2: Convert to fraction form
   31,520/64,480 = 64,480/x
3. Step 3: Cross multiply
   31,520x = 64,480 × 64,480
4. Step 4: Simplify right side
   31,520x = 4,157,670,400
5. Step 5: Solve for x
   x = 4,157,670,400/31,520
6. Step 6: Final answer
   x = 131,905.79