Finding the Third Proportional to 456,583.50 and 648,990

Step by Step Solution

1. Step 1: Write the proportion equation
   456,583.50 : 648,990 = 648,990 : x
2. Step 2: Convert to fraction form
   456,583.50/648,990 = 648,990/x
3. Step 3: Cross multiply
   456,583.50x = 648,990 × 648,990
4. Step 4: Simplify right side
   456,583.50x = 421,188,020,100
5. Step 5: Solve for x
   x = 421,188,020,100/456,583.50
6. Step 6: Final answer
   x = 922,477.53