Finding the Third Proportional to 218,990 and 472,164

Step by Step Solution

1. Step 1: Write the proportion equation
   218,990 : 472,164 = 472,164 : x
2. Step 2: Convert to fraction form
   218,990/472,164 = 472,164/x
3. Step 3: Cross multiply
   218,990x = 472,164 × 472,164
4. Step 4: Simplify right side
   218,990x = 222,938,842,896
5. Step 5: Solve for x
   x = 222,938,842,896/218,990
6. Step 6: Final answer
   x = 1,018,032.07