Finding the Third Proportional to 90,300 and 207,678

Step by Step Solution

1. Step 1: Write the proportion equation
   90,300 : 207,678 = 207,678 : x
2. Step 2: Convert to fraction form
   90,300/207,678 = 207,678/x
3. Step 3: Cross multiply
   90,300x = 207,678 × 207,678
4. Step 4: Simplify right side
   90,300x = 43,130,151,684
5. Step 5: Solve for x
   x = 43,130,151,684/90,300
6. Step 6: Final answer
   x = 477,631.80