Finding the Third Proportional to 42,328 and 66,078

Step by Step Solution

1. Step 1: Write the proportion equation
   42,328 : 66,078 = 66,078 : x
2. Step 2: Convert to fraction form
   42,328/66,078 = 66,078/x
3. Step 3: Cross multiply
   42,328x = 66,078 × 66,078
4. Step 4: Simplify right side
   42,328x = 4,366,302,084
5. Step 5: Solve for x
   x = 4,366,302,084/42,328
6. Step 6: Final answer
   x = 103,153.99