Finding the Third Proportional to 128,780 and 197,010.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,780 : 197,010.50 = 197,010.50 : x
2. Step 2: Convert to fraction form
   128,780/197,010.50 = 197,010.50/x
3. Step 3: Cross multiply
   128,780x = 197,010.50 × 197,010.50
4. Step 4: Simplify right side
   128,780x = 38,813,137,110.25
5. Step 5: Solve for x
   x = 38,813,137,110.25/128,780
6. Step 6: Final answer
   x = 301,391.03