Finding the Third Proportional to 298,030.50 and 638,673

Step by Step Solution

1. Step 1: Write the proportion equation
   298,030.50 : 638,673 = 638,673 : x
2. Step 2: Convert to fraction form
   298,030.50/638,673 = 638,673/x
3. Step 3: Cross multiply
   298,030.50x = 638,673 × 638,673
4. Step 4: Simplify right side
   298,030.50x = 407,903,200,929
5. Step 5: Solve for x
   x = 407,903,200,929/298,030.50
6. Step 6: Final answer
   x = 1,368,662.61