Finding the Fourth Proportional to 16,721.91, 23,031.89 and 12,459.32

Step by Step Solution

1. Step 1: Write the proportion equation
   16,721.91 : 23,031.89 = 12,459.32 : x
2. Step 2: Convert to fraction form
   16,721.91/23,031.89 = 12,459.32/x
3. Step 3: Cross multiply
   16,721.91x = 23,031.89 × 12,459.32
4. Step 4: Simplify right side
   16,721.91x = 286,961,713.43
5. Step 5: Solve for x
   x = 286,961,713.43/16,721.91
6. Step 6: Final answer
   x = 17,160.82