Finding the Third Proportional to 30,690 and 67,235.50

Step by Step Solution

1. Step 1: Write the proportion equation
   30,690 : 67,235.50 = 67,235.50 : x
2. Step 2: Convert to fraction form
   30,690/67,235.50 = 67,235.50/x
3. Step 3: Cross multiply
   30,690x = 67,235.50 × 67,235.50
4. Step 4: Simplify right side
   30,690x = 4,520,612,460.25
5. Step 5: Solve for x
   x = 4,520,612,460.25/30,690
6. Step 6: Final answer
   x = 147,299.20