Finding the Third Proportional to 30,883.78 and 67,431.55

Step by Step Solution

1. Step 1: Write the proportion equation
   30,883.78 : 67,431.55 = 67,431.55 : x
2. Step 2: Convert to fraction form
   30,883.78/67,431.55 = 67,431.55/x
3. Step 3: Cross multiply
   30,883.78x = 67,431.55 × 67,431.55
4. Step 4: Simplify right side
   30,883.78x = 4,547,014,040.76
5. Step 5: Solve for x
   x = 4,547,014,040.76/30,883.78
6. Step 6: Final answer
   x = 147,229.84