Finding the Third Proportional to 18,688.50 and 31,146.75

Step by Step Solution

1. Step 1: Write the proportion equation
   18,688.50 : 31,146.75 = 31,146.75 : x
2. Step 2: Convert to fraction form
   18,688.50/31,146.75 = 31,146.75/x
3. Step 3: Cross multiply
   18,688.50x = 31,146.75 × 31,146.75
4. Step 4: Simplify right side
   18,688.50x = 970,120,035.56
5. Step 5: Solve for x
   x = 970,120,035.56/18,688.50
6. Step 6: Final answer
   x = 51,910.00