Finding the Third Proportional to 453,640.50 and 990,288

Step by Step Solution

1. Step 1: Write the proportion equation
   453,640.50 : 990,288 = 990,288 : x
2. Step 2: Convert to fraction form
   453,640.50/990,288 = 990,288/x
3. Step 3: Cross multiply
   453,640.50x = 990,288 × 990,288
4. Step 4: Simplify right side
   453,640.50x = 980,670,322,944
5. Step 5: Solve for x
   x = 980,670,322,944/453,640.50
6. Step 6: Final answer
   x = 2,161,778.60