Finding the Third Proportional to 294,409.50 and 638,607

Step by Step Solution

1. Step 1: Write the proportion equation
   294,409.50 : 638,607 = 638,607 : x
2. Step 2: Convert to fraction form
   294,409.50/638,607 = 638,607/x
3. Step 3: Cross multiply
   294,409.50x = 638,607 × 638,607
4. Step 4: Simplify right side
   294,409.50x = 407,818,900,449
5. Step 5: Solve for x
   x = 407,818,900,449/294,409.50
6. Step 6: Final answer
   x = 1,385,209.72