Finding the Third Proportional to 139,036 and 305,143

Step by Step Solution

1. Step 1: Write the proportion equation
   139,036 : 305,143 = 305,143 : x
2. Step 2: Convert to fraction form
   139,036/305,143 = 305,143/x
3. Step 3: Cross multiply
   139,036x = 305,143 × 305,143
4. Step 4: Simplify right side
   139,036x = 93,112,250,449
5. Step 5: Solve for x
   x = 93,112,250,449/139,036
6. Step 6: Final answer
   x = 669,698.86