Finding the Third Proportional to 18,731.46 and 40,128.12

Step by Step Solution

1. Step 1: Write the proportion equation
   18,731.46 : 40,128.12 = 40,128.12 : x
2. Step 2: Convert to fraction form
   18,731.46/40,128.12 = 40,128.12/x
3. Step 3: Cross multiply
   18,731.46x = 40,128.12 × 40,128.12
4. Step 4: Simplify right side
   18,731.46x = 1,610,265,789.01
5. Step 5: Solve for x
   x = 1,610,265,789.01/18,731.46
6. Step 6: Final answer
   x = 85,965.84