Finding the Fourth Proportional to 13,026.86, 17,987.34 and 12,031.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,026.86 : 17,987.34 = 12,031.72 : x
2. Step 2: Convert to fraction form
   13,026.86/17,987.34 = 12,031.72/x
3. Step 3: Cross multiply
   13,026.86x = 17,987.34 × 12,031.72
4. Step 4: Simplify right side
   13,026.86x = 216,418,638.42
5. Step 5: Solve for x
   x = 216,418,638.42/13,026.86
6. Step 6: Final answer
   x = 16,613.26