Finding the Fourth Proportional to 16,816.65, 23,215.35 and 13,031.25

Step by Step Solution

1. Step 1: Write the proportion equation
   16,816.65 : 23,215.35 = 13,031.25 : x
2. Step 2: Convert to fraction form
   16,816.65/23,215.35 = 13,031.25/x
3. Step 3: Cross multiply
   16,816.65x = 23,215.35 × 13,031.25
4. Step 4: Simplify right side
   16,816.65x = 302,525,029.69
5. Step 5: Solve for x
   x = 302,525,029.69/16,816.65
6. Step 6: Final answer
   x = 17,989.61