Finding the Third Proportional to 63,400 and 88,640

Step by Step Solution

1. Step 1: Write the proportion equation
   63,400 : 88,640 = 88,640 : x
2. Step 2: Convert to fraction form
   63,400/88,640 = 88,640/x
3. Step 3: Cross multiply
   63,400x = 88,640 × 88,640
4. Step 4: Simplify right side
   63,400x = 7,857,049,600
5. Step 5: Solve for x
   x = 7,857,049,600/63,400
6. Step 6: Final answer
   x = 123,928.23