Finding the Third Proportional to 30,640 and 63,248

Step by Step Solution

1. Step 1: Write the proportion equation
   30,640 : 63,248 = 63,248 : x
2. Step 2: Convert to fraction form
   30,640/63,248 = 63,248/x
3. Step 3: Cross multiply
   30,640x = 63,248 × 63,248
4. Step 4: Simplify right side
   30,640x = 4,000,309,504
5. Step 5: Solve for x
   x = 4,000,309,504/30,640
6. Step 6: Final answer
   x = 130,558.40