Finding the Third Proportional to 9,911.81 and 13,213.69

Step by Step Solution

1. Step 1: Write the proportion equation
   9,911.81 : 13,213.69 = 13,213.69 : x
2. Step 2: Convert to fraction form
   9,911.81/13,213.69 = 13,213.69/x
3. Step 3: Cross multiply
   9,911.81x = 13,213.69 × 13,213.69
4. Step 4: Simplify right side
   9,911.81x = 174,601,537.35
5. Step 5: Solve for x
   x = 174,601,537.35/9,911.81
6. Step 6: Final answer
   x = 17,615.50