Finding the Third Proportional to 210,824 and 456,640

Step by Step Solution

1. Step 1: Write the proportion equation
   210,824 : 456,640 = 456,640 : x
2. Step 2: Convert to fraction form
   210,824/456,640 = 456,640/x
3. Step 3: Cross multiply
   210,824x = 456,640 × 456,640
4. Step 4: Simplify right side
   210,824x = 208,520,089,600
5. Step 5: Solve for x
   x = 208,520,089,600/210,824
6. Step 6: Final answer
   x = 989,071.88