Finding the Third Proportional to 67,587 and 139,458

Step by Step Solution

1. Step 1: Write the proportion equation
   67,587 : 139,458 = 139,458 : x
2. Step 2: Convert to fraction form
   67,587/139,458 = 139,458/x
3. Step 3: Cross multiply
   67,587x = 139,458 × 139,458
4. Step 4: Simplify right side
   67,587x = 19,448,533,764
5. Step 5: Solve for x
   x = 19,448,533,764/67,587
6. Step 6: Final answer
   x = 287,755.54