Finding the Third Proportional to 294,900.75 and 639,738

Step by Step Solution

1. Step 1: Write the proportion equation
   294,900.75 : 639,738 = 639,738 : x
2. Step 2: Convert to fraction form
   294,900.75/639,738 = 639,738/x
3. Step 3: Cross multiply
   294,900.75x = 639,738 × 639,738
4. Step 4: Simplify right side
   294,900.75x = 409,264,708,644
5. Step 5: Solve for x
   x = 409,264,708,644/294,900.75
6. Step 6: Final answer
   x = 1,387,804.91