Finding the Third Proportional to 30,994 and 67,139

Step by Step Solution

1. Step 1: Write the proportion equation
   30,994 : 67,139 = 67,139 : x
2. Step 2: Convert to fraction form
   30,994/67,139 = 67,139/x
3. Step 3: Cross multiply
   30,994x = 67,139 × 67,139
4. Step 4: Simplify right side
   30,994x = 4,507,645,321
5. Step 5: Solve for x
   x = 4,507,645,321/30,994
6. Step 6: Final answer
   x = 145,436.06