Finding the Third Proportional to 89,410.50 and 139,396.50

Step by Step Solution

1. Step 1: Write the proportion equation
   89,410.50 : 139,396.50 = 139,396.50 : x
2. Step 2: Convert to fraction form
   89,410.50/139,396.50 = 139,396.50/x
3. Step 3: Cross multiply
   89,410.50x = 139,396.50 × 139,396.50
4. Step 4: Simplify right side
   89,410.50x = 19,431,384,212.25
5. Step 5: Solve for x
   x = 19,431,384,212.25/89,410.50
6. Step 6: Final answer
   x = 217,327.77