Finding the Third Proportional to 294,775.50 and 639,123

Step by Step Solution

1. Step 1: Write the proportion equation
   294,775.50 : 639,123 = 639,123 : x
2. Step 2: Convert to fraction form
   294,775.50/639,123 = 639,123/x
3. Step 3: Cross multiply
   294,775.50x = 639,123 × 639,123
4. Step 4: Simplify right side
   294,775.50x = 408,478,209,129
5. Step 5: Solve for x
   x = 408,478,209,129/294,775.50
6. Step 6: Final answer
   x = 1,385,726.46