Finding the Third Proportional to 30,678.75 and 66,961.69

Step by Step Solution

1. Step 1: Write the proportion equation
   30,678.75 : 66,961.69 = 66,961.69 : x
2. Step 2: Convert to fraction form
   30,678.75/66,961.69 = 66,961.69/x
3. Step 3: Cross multiply
   30,678.75x = 66,961.69 × 66,961.69
4. Step 4: Simplify right side
   30,678.75x = 4,483,867,592.85
5. Step 5: Solve for x
   x = 4,483,867,592.85/30,678.75
6. Step 6: Final answer
   x = 146,155.49