Finding the Third Proportional to 219,286 and 478,172

Step by Step Solution

1. Step 1: Write the proportion equation
   219,286 : 478,172 = 478,172 : x
2. Step 2: Convert to fraction form
   219,286/478,172 = 478,172/x
3. Step 3: Cross multiply
   219,286x = 478,172 × 478,172
4. Step 4: Simplify right side
   219,286x = 228,648,461,584
5. Step 5: Solve for x
   x = 228,648,461,584/219,286
6. Step 6: Final answer
   x = 1,042,695.21