Finding the Third Proportional to 222,210 and 478,138.50

Step by Step Solution

1. Step 1: Write the proportion equation
   222,210 : 478,138.50 = 478,138.50 : x
2. Step 2: Convert to fraction form
   222,210/478,138.50 = 478,138.50/x
3. Step 3: Cross multiply
   222,210x = 478,138.50 × 478,138.50
4. Step 4: Simplify right side
   222,210x = 228,616,425,182.25
5. Step 5: Solve for x
   x = 228,616,425,182.25/222,210
6. Step 6: Final answer
   x = 1,028,830.50