Finding the Third Proportional to 42,128 and 90,604

Step by Step Solution

1. Step 1: Write the proportion equation
   42,128 : 90,604 = 90,604 : x
2. Step 2: Convert to fraction form
   42,128/90,604 = 90,604/x
3. Step 3: Cross multiply
   42,128x = 90,604 × 90,604
4. Step 4: Simplify right side
   42,128x = 8,209,084,816
5. Step 5: Solve for x
   x = 8,209,084,816/42,128
6. Step 6: Final answer
   x = 194,860.54