Finding the Third Proportional to 21,288.50 and 43,185

Step by Step Solution

1. Step 1: Write the proportion equation
   21,288.50 : 43,185 = 43,185 : x
2. Step 2: Convert to fraction form
   21,288.50/43,185 = 43,185/x
3. Step 3: Cross multiply
   21,288.50x = 43,185 × 43,185
4. Step 4: Simplify right side
   21,288.50x = 1,864,944,225
5. Step 5: Solve for x
   x = 1,864,944,225/21,288.50
6. Step 6: Final answer
   x = 87,603.36