Finding the Third Proportional to 9,918.75 and 20,659.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,918.75 : 20,659.50 = 20,659.50 : x
2. Step 2: Convert to fraction form
   9,918.75/20,659.50 = 20,659.50/x
3. Step 3: Cross multiply
   9,918.75x = 20,659.50 × 20,659.50
4. Step 4: Simplify right side
   9,918.75x = 426,814,940.25
5. Step 5: Solve for x
   x = 426,814,940.25/9,918.75
6. Step 6: Final answer
   x = 43,031.12