Finding the Third Proportional to 221,430 and 485,424

Step by Step Solution

1. Step 1: Write the proportion equation
   221,430 : 485,424 = 485,424 : x
2. Step 2: Convert to fraction form
   221,430/485,424 = 485,424/x
3. Step 3: Cross multiply
   221,430x = 485,424 × 485,424
4. Step 4: Simplify right side
   221,430x = 235,636,459,776
5. Step 5: Solve for x
   x = 235,636,459,776/221,430
6. Step 6: Final answer
   x = 1,064,157.79