Finding the Third Proportional to 217,123 and 478,419.50

Step by Step Solution

1. Step 1: Write the proportion equation
   217,123 : 478,419.50 = 478,419.50 : x
2. Step 2: Convert to fraction form
   217,123/478,419.50 = 478,419.50/x
3. Step 3: Cross multiply
   217,123x = 478,419.50 × 478,419.50
4. Step 4: Simplify right side
   217,123x = 228,885,217,980.25
5. Step 5: Solve for x
   x = 228,885,217,980.25/217,123
6. Step 6: Final answer
   x = 1,054,173.06