Finding the Fourth Proportional to 21,039.76, 29,022.06 and 12,536.29

Step by Step Solution

1. Step 1: Write the proportion equation
   21,039.76 : 29,022.06 = 12,536.29 : x
2. Step 2: Convert to fraction form
   21,039.76/29,022.06 = 12,536.29/x
3. Step 3: Cross multiply
   21,039.76x = 29,022.06 × 12,536.29
4. Step 4: Simplify right side
   21,039.76x = 363,828,960.56
5. Step 5: Solve for x
   x = 363,828,960.56/21,039.76
6. Step 6: Final answer
   x = 17,292.45