Finding the Third Proportional to 456,939 and 990,144

Step by Step Solution

1. Step 1: Write the proportion equation
   456,939 : 990,144 = 990,144 : x
2. Step 2: Convert to fraction form
   456,939/990,144 = 990,144/x
3. Step 3: Cross multiply
   456,939x = 990,144 × 990,144
4. Step 4: Simplify right side
   456,939x = 980,385,140,736
5. Step 5: Solve for x
   x = 980,385,140,736/456,939
6. Step 6: Final answer
   x = 2,145,549.28