Finding the Third Proportional to 221,838 and 487,920

Step by Step Solution

1. Step 1: Write the proportion equation
   221,838 : 487,920 = 487,920 : x
2. Step 2: Convert to fraction form
   221,838/487,920 = 487,920/x
3. Step 3: Cross multiply
   221,838x = 487,920 × 487,920
4. Step 4: Simplify right side
   221,838x = 238,065,926,400
5. Step 5: Solve for x
   x = 238,065,926,400/221,838
6. Step 6: Final answer
   x = 1,073,152.15