Finding the Third Proportional to 139,443 and 305,499

Step by Step Solution

1. Step 1: Write the proportion equation
   139,443 : 305,499 = 305,499 : x
2. Step 2: Convert to fraction form
   139,443/305,499 = 305,499/x
3. Step 3: Cross multiply
   139,443x = 305,499 × 305,499
4. Step 4: Simplify right side
   139,443x = 93,329,639,001
5. Step 5: Solve for x
   x = 93,329,639,001/139,443
6. Step 6: Final answer
   x = 669,303.15