Finding the Third Proportional to 221,564 and 487,432

Step by Step Solution

1. Step 1: Write the proportion equation
   221,564 : 487,432 = 487,432 : x
2. Step 2: Convert to fraction form
   221,564/487,432 = 487,432/x
3. Step 3: Cross multiply
   221,564x = 487,432 × 487,432
4. Step 4: Simplify right side
   221,564x = 237,589,954,624
5. Step 5: Solve for x
   x = 237,589,954,624/221,564
6. Step 6: Final answer
   x = 1,072,331.04