Finding the Third Proportional to 217,136 and 478,444

Step by Step Solution

1. Step 1: Write the proportion equation
   217,136 : 478,444 = 478,444 : x
2. Step 2: Convert to fraction form
   217,136/478,444 = 478,444/x
3. Step 3: Cross multiply
   217,136x = 478,444 × 478,444
4. Step 4: Simplify right side
   217,136x = 228,908,661,136
5. Step 5: Solve for x
   x = 228,908,661,136/217,136
6. Step 6: Final answer
   x = 1,054,217.91