Finding the Fourth Proportional to 21,031.32, 29,015.89 and 13,481.81

Step by Step Solution

1. Step 1: Write the proportion equation
   21,031.32 : 29,015.89 = 13,481.81 : x
2. Step 2: Convert to fraction form
   21,031.32/29,015.89 = 13,481.81/x
3. Step 3: Cross multiply
   21,031.32x = 29,015.89 × 13,481.81
4. Step 4: Simplify right side
   21,031.32x = 391,186,648.55
5. Step 5: Solve for x
   x = 391,186,648.55/21,031.32
6. Step 6: Final answer
   x = 18,600.19