Finding the Third Proportional to 301,837.50 and 639,654

Step by Step Solution

1. Step 1: Write the proportion equation
   301,837.50 : 639,654 = 639,654 : x
2. Step 2: Convert to fraction form
   301,837.50/639,654 = 639,654/x
3. Step 3: Cross multiply
   301,837.50x = 639,654 × 639,654
4. Step 4: Simplify right side
   301,837.50x = 409,157,239,716
5. Step 5: Solve for x
   x = 409,157,239,716/301,837.50
6. Step 6: Final answer
   x = 1,355,554.69