Finding the Third Proportional to 90,618.50 and 213,208

Step by Step Solution

1. Step 1: Write the proportion equation
   90,618.50 : 213,208 = 213,208 : x
2. Step 2: Convert to fraction form
   90,618.50/213,208 = 213,208/x
3. Step 3: Cross multiply
   90,618.50x = 213,208 × 213,208
4. Step 4: Simplify right side
   90,618.50x = 45,457,651,264
5. Step 5: Solve for x
   x = 45,457,651,264/90,618.50
6. Step 6: Final answer
   x = 501,637.65