Finding the Third Proportional to 129,100.50 and 199,401.75

Step by Step Solution

1. Step 1: Write the proportion equation
   129,100.50 : 199,401.75 = 199,401.75 : x
2. Step 2: Convert to fraction form
   129,100.50/199,401.75 = 199,401.75/x
3. Step 3: Cross multiply
   129,100.50x = 199,401.75 × 199,401.75
4. Step 4: Simplify right side
   129,100.50x = 39,761,057,903.06
5. Step 5: Solve for x
   x = 39,761,057,903.06/129,100.50
6. Step 6: Final answer
   x = 307,985.31