Finding the Third Proportional to 30,890 and 67,490

Step by Step Solution

1. Step 1: Write the proportion equation
   30,890 : 67,490 = 67,490 : x
2. Step 2: Convert to fraction form
   30,890/67,490 = 67,490/x
3. Step 3: Cross multiply
   30,890x = 67,490 × 67,490
4. Step 4: Simplify right side
   30,890x = 4,554,900,100
5. Step 5: Solve for x
   x = 4,554,900,100/30,890
6. Step 6: Final answer
   x = 147,455.49