Finding the Third Proportional to 298,888.50 and 645,003

Step by Step Solution

1. Step 1: Write the proportion equation
   298,888.50 : 645,003 = 645,003 : x
2. Step 2: Convert to fraction form
   298,888.50/645,003 = 645,003/x
3. Step 3: Cross multiply
   298,888.50x = 645,003 × 645,003
4. Step 4: Simplify right side
   298,888.50x = 416,028,870,009
5. Step 5: Solve for x
   x = 416,028,870,009/298,888.50
6. Step 6: Final answer
   x = 1,391,919.96