Finding the Third Proportional to 42,138 and 90,108

Step by Step Solution

1. Step 1: Write the proportion equation
   42,138 : 90,108 = 90,108 : x
2. Step 2: Convert to fraction form
   42,138/90,108 = 90,108/x
3. Step 3: Cross multiply
   42,138x = 90,108 × 90,108
4. Step 4: Simplify right side
   42,138x = 8,119,451,664
5. Step 5: Solve for x
   x = 8,119,451,664/42,138
6. Step 6: Final answer
   x = 192,687.16