Finding the Third Proportional to 42,480 and 90,020

Step by Step Solution

1. Step 1: Write the proportion equation
   42,480 : 90,020 = 90,020 : x
2. Step 2: Convert to fraction form
   42,480/90,020 = 90,020/x
3. Step 3: Cross multiply
   42,480x = 90,020 × 90,020
4. Step 4: Simplify right side
   42,480x = 8,103,600,400
5. Step 5: Solve for x
   x = 8,103,600,400/42,480
6. Step 6: Final answer
   x = 190,762.72