Finding the Third Proportional to 63,138 and 140,290

Step by Step Solution

1. Step 1: Write the proportion equation
   63,138 : 140,290 = 140,290 : x
2. Step 2: Convert to fraction form
   63,138/140,290 = 140,290/x
3. Step 3: Cross multiply
   63,138x = 140,290 × 140,290
4. Step 4: Simplify right side
   63,138x = 19,681,284,100
5. Step 5: Solve for x
   x = 19,681,284,100/63,138
6. Step 6: Final answer
   x = 311,718.52