Finding the Third Proportional to 59,919.75 and 129,181.50

Step by Step Solution

1. Step 1: Write the proportion equation
   59,919.75 : 129,181.50 = 129,181.50 : x
2. Step 2: Convert to fraction form
   59,919.75/129,181.50 = 129,181.50/x
3. Step 3: Cross multiply
   59,919.75x = 129,181.50 × 129,181.50
4. Step 4: Simplify right side
   59,919.75x = 16,687,859,942.25
5. Step 5: Solve for x
   x = 16,687,859,942.25/59,919.75
6. Step 6: Final answer
   x = 278,503.50