Finding the Third Proportional to 298,035 and 638,682.75

Step by Step Solution

1. Step 1: Write the proportion equation
   298,035 : 638,682.75 = 638,682.75 : x
2. Step 2: Convert to fraction form
   298,035/638,682.75 = 638,682.75/x
3. Step 3: Cross multiply
   298,035x = 638,682.75 × 638,682.75
4. Step 4: Simplify right side
   298,035x = 407,915,655,147.56
5. Step 5: Solve for x
   x = 407,915,655,147.56/298,035
6. Step 6: Final answer
   x = 1,368,683.73