Finding the Third Proportional to 139,938 and 306,118.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,938 : 306,118.50 = 306,118.50 : x
2. Step 2: Convert to fraction form
   139,938/306,118.50 = 306,118.50/x
3. Step 3: Cross multiply
   139,938x = 306,118.50 × 306,118.50
4. Step 4: Simplify right side
   139,938x = 93,708,536,042.25
5. Step 5: Solve for x
   x = 93,708,536,042.25/139,938
6. Step 6: Final answer
   x = 669,643.24