Finding the Third Proportional to 85,903.50 and 129,018

Step by Step Solution

1. Step 1: Write the proportion equation
   85,903.50 : 129,018 = 129,018 : x
2. Step 2: Convert to fraction form
   85,903.50/129,018 = 129,018/x
3. Step 3: Cross multiply
   85,903.50x = 129,018 × 129,018
4. Step 4: Simplify right side
   85,903.50x = 16,645,644,324
5. Step 5: Solve for x
   x = 16,645,644,324/85,903.50
6. Step 6: Final answer
   x = 193,771.43