Finding the Third Proportional to 221,520 and 472,040

Step by Step Solution

1. Step 1: Write the proportion equation
   221,520 : 472,040 = 472,040 : x
2. Step 2: Convert to fraction form
   221,520/472,040 = 472,040/x
3. Step 3: Cross multiply
   221,520x = 472,040 × 472,040
4. Step 4: Simplify right side
   221,520x = 222,821,761,600
5. Step 5: Solve for x
   x = 222,821,761,600/221,520
6. Step 6: Final answer
   x = 1,005,876.50