Finding the Third Proportional to 298,903 and 645,025.50

Step by Step Solution

1. Step 1: Write the proportion equation
   298,903 : 645,025.50 = 645,025.50 : x
2. Step 2: Convert to fraction form
   298,903/645,025.50 = 645,025.50/x
3. Step 3: Cross multiply
   298,903x = 645,025.50 × 645,025.50
4. Step 4: Simplify right side
   298,903x = 416,057,895,650.25
5. Step 5: Solve for x
   x = 416,057,895,650.25/298,903
6. Step 6: Final answer
   x = 1,391,949.55