Finding the Third Proportional to 63,812 and 139,900

Step by Step Solution

1. Step 1: Write the proportion equation
   63,812 : 139,900 = 139,900 : x
2. Step 2: Convert to fraction form
   63,812/139,900 = 139,900/x
3. Step 3: Cross multiply
   63,812x = 139,900 × 139,900
4. Step 4: Simplify right side
   63,812x = 19,572,010,000
5. Step 5: Solve for x
   x = 19,572,010,000/63,812
6. Step 6: Final answer
   x = 306,713.63