Finding the Third Proportional to 40,218.50 and 86,603.50

Step by Step Solution

1. Step 1: Write the proportion equation
   40,218.50 : 86,603.50 = 86,603.50 : x
2. Step 2: Convert to fraction form
   40,218.50/86,603.50 = 86,603.50/x
3. Step 3: Cross multiply
   40,218.50x = 86,603.50 × 86,603.50
4. Step 4: Simplify right side
   40,218.50x = 7,500,166,212.25
5. Step 5: Solve for x
   x = 7,500,166,212.25/40,218.50
6. Step 6: Final answer
   x = 186,485.48