Finding the Third Proportional to 215,490 and 472,128

Step by Step Solution

1. Step 1: Write the proportion equation
   215,490 : 472,128 = 472,128 : x
2. Step 2: Convert to fraction form
   215,490/472,128 = 472,128/x
3. Step 3: Cross multiply
   215,490x = 472,128 × 472,128
4. Step 4: Simplify right side
   215,490x = 222,904,848,384
5. Step 5: Solve for x
   x = 222,904,848,384/215,490
6. Step 6: Final answer
   x = 1,034,409.25