Finding the Third Proportional to 298,027.50 and 638,667.75

Step by Step Solution

1. Step 1: Write the proportion equation
   298,027.50 : 638,667.75 = 638,667.75 : x
2. Step 2: Convert to fraction form
   298,027.50/638,667.75 = 638,667.75/x
3. Step 3: Cross multiply
   298,027.50x = 638,667.75 × 638,667.75
4. Step 4: Simplify right side
   298,027.50x = 407,896,494,890.06
5. Step 5: Solve for x
   x = 407,896,494,890.06/298,027.50
6. Step 6: Final answer
   x = 1,368,653.88