Finding the Third Proportional to 31,900.50 and 69,936.75

Step by Step Solution

1. Step 1: Write the proportion equation
   31,900.50 : 69,936.75 = 69,936.75 : x
2. Step 2: Convert to fraction form
   31,900.50/69,936.75 = 69,936.75/x
3. Step 3: Cross multiply
   31,900.50x = 69,936.75 × 69,936.75
4. Step 4: Simplify right side
   31,900.50x = 4,891,149,000.56
5. Step 5: Solve for x
   x = 4,891,149,000.56/31,900.50
6. Step 6: Final answer
   x = 153,325.15