Finding the Third Proportional to 42,290 and 66,945

Step by Step Solution

1. Step 1: Write the proportion equation
   42,290 : 66,945 = 66,945 : x
2. Step 2: Convert to fraction form
   42,290/66,945 = 66,945/x
3. Step 3: Cross multiply
   42,290x = 66,945 × 66,945
4. Step 4: Simplify right side
   42,290x = 4,481,633,025
5. Step 5: Solve for x
   x = 4,481,633,025/42,290
6. Step 6: Final answer
   x = 105,973.82