Finding the Third Proportional to 303,096.50 and 638,143

Step by Step Solution

1. Step 1: Write the proportion equation
   303,096.50 : 638,143 = 638,143 : x
2. Step 2: Convert to fraction form
   303,096.50/638,143 = 638,143/x
3. Step 3: Cross multiply
   303,096.50x = 638,143 × 638,143
4. Step 4: Simplify right side
   303,096.50x = 407,226,488,449
5. Step 5: Solve for x
   x = 407,226,488,449/303,096.50
6. Step 6: Final answer
   x = 1,343,553.91