Finding the Third Proportional to 42,661.69 and 66,118.78

Step by Step Solution

1. Step 1: Write the proportion equation
   42,661.69 : 66,118.78 = 66,118.78 : x
2. Step 2: Convert to fraction form
   42,661.69/66,118.78 = 66,118.78/x
3. Step 3: Cross multiply
   42,661.69x = 66,118.78 × 66,118.78
4. Step 4: Simplify right side
   42,661.69x = 4,371,693,233.99
5. Step 5: Solve for x
   x = 4,371,693,233.99/42,661.69
6. Step 6: Final answer
   x = 102,473.52