Finding the Third Proportional to 217,122 and 478,417.50

Step by Step Solution

1. Step 1: Write the proportion equation
   217,122 : 478,417.50 = 478,417.50 : x
2. Step 2: Convert to fraction form
   217,122/478,417.50 = 478,417.50/x
3. Step 3: Cross multiply
   217,122x = 478,417.50 × 478,417.50
4. Step 4: Simplify right side
   217,122x = 228,883,304,306.25
5. Step 5: Solve for x
   x = 228,883,304,306.25/217,122
6. Step 6: Final answer
   x = 1,054,169.10