Finding the Third Proportional to 42,309 and 90,449

Step by Step Solution

1. Step 1: Write the proportion equation
   42,309 : 90,449 = 90,449 : x
2. Step 2: Convert to fraction form
   42,309/90,449 = 90,449/x
3. Step 3: Cross multiply
   42,309x = 90,449 × 90,449
4. Step 4: Simplify right side
   42,309x = 8,181,021,601
5. Step 5: Solve for x
   x = 8,181,021,601/42,309
6. Step 6: Final answer
   x = 193,363.62