Finding the Third Proportional to 217,130 and 478,434

Step by Step Solution

1. Step 1: Write the proportion equation
   217,130 : 478,434 = 478,434 : x
2. Step 2: Convert to fraction form
   217,130/478,434 = 478,434/x
3. Step 3: Cross multiply
   217,130x = 478,434 × 478,434
4. Step 4: Simplify right side
   217,130x = 228,899,092,356
5. Step 5: Solve for x
   x = 228,899,092,356/217,130
6. Step 6: Final answer
   x = 1,054,202.98