Finding the Third Proportional to 63,900 and 89,599.50

Step by Step Solution

1. Step 1: Write the proportion equation
   63,900 : 89,599.50 = 89,599.50 : x
2. Step 2: Convert to fraction form
   63,900/89,599.50 = 89,599.50/x
3. Step 3: Cross multiply
   63,900x = 89,599.50 × 89,599.50
4. Step 4: Simplify right side
   63,900x = 8,028,070,400.25
5. Step 5: Solve for x
   x = 8,028,070,400.25/63,900
6. Step 6: Final answer
   x = 125,634.90