Finding the Third Proportional to 270,863.50 and 419,990

Step by Step Solution

1. Step 1: Write the proportion equation
   270,863.50 : 419,990 = 419,990 : x
2. Step 2: Convert to fraction form
   270,863.50/419,990 = 419,990/x
3. Step 3: Cross multiply
   270,863.50x = 419,990 × 419,990
4. Step 4: Simplify right side
   270,863.50x = 176,391,600,100
5. Step 5: Solve for x
   x = 176,391,600,100/270,863.50
6. Step 6: Final answer
   x = 651,219.53