Finding the Third Proportional to 42,418 and 67,156

Step by Step Solution

1. Step 1: Write the proportion equation
   42,418 : 67,156 = 67,156 : x
2. Step 2: Convert to fraction form
   42,418/67,156 = 67,156/x
3. Step 3: Cross multiply
   42,418x = 67,156 × 67,156
4. Step 4: Simplify right side
   42,418x = 4,509,928,336
5. Step 5: Solve for x
   x = 4,509,928,336/42,418
6. Step 6: Final answer
   x = 106,321.10