Finding the Third Proportional to 90,559.69 and 198,615.38

Step by Step Solution

1. Step 1: Write the proportion equation
   90,559.69 : 198,615.38 = 198,615.38 : x
2. Step 2: Convert to fraction form
   90,559.69/198,615.38 = 198,615.38/x
3. Step 3: Cross multiply
   90,559.69x = 198,615.38 × 198,615.38
4. Step 4: Simplify right side
   90,559.69x = 39,448,067,186.39
5. Step 5: Solve for x
   x = 39,448,067,186.39/90,559.69
6. Step 6: Final answer
   x = 435,602.95