Finding the Third Proportional to 63,330 and 139,300

Step by Step Solution

1. Step 1: Write the proportion equation
   63,330 : 139,300 = 139,300 : x
2. Step 2: Convert to fraction form
   63,330/139,300 = 139,300/x
3. Step 3: Cross multiply
   63,330x = 139,300 × 139,300
4. Step 4: Simplify right side
   63,330x = 19,404,490,000
5. Step 5: Solve for x
   x = 19,404,490,000/63,330
6. Step 6: Final answer
   x = 306,402.81