Finding the Third Proportional to 70,689.50 and 149,559.50

Step by Step Solution

1. Step 1: Write the proportion equation
   70,689.50 : 149,559.50 = 149,559.50 : x
2. Step 2: Convert to fraction form
   70,689.50/149,559.50 = 149,559.50/x
3. Step 3: Cross multiply
   70,689.50x = 149,559.50 × 149,559.50
4. Step 4: Simplify right side
   70,689.50x = 22,368,044,040.25
5. Step 5: Solve for x
   x = 22,368,044,040.25/70,689.50
6. Step 6: Final answer
   x = 316,426.68