Finding the Third Proportional to 59,105.50 and 128,258

Step by Step Solution

1. Step 1: Write the proportion equation
   59,105.50 : 128,258 = 128,258 : x
2. Step 2: Convert to fraction form
   59,105.50/128,258 = 128,258/x
3. Step 3: Cross multiply
   59,105.50x = 128,258 × 128,258
4. Step 4: Simplify right side
   59,105.50x = 16,450,114,564
5. Step 5: Solve for x
   x = 16,450,114,564/59,105.50
6. Step 6: Final answer
   x = 278,317.83