Finding the Fourth Proportional to 21,041.98, 29,048.45 and 13,086.77

Step by Step Solution

1. Step 1: Write the proportion equation
   21,041.98 : 29,048.45 = 13,086.77 : x
2. Step 2: Convert to fraction form
   21,041.98/29,048.45 = 13,086.77/x
3. Step 3: Cross multiply
   21,041.98x = 29,048.45 × 13,086.77
4. Step 4: Simplify right side
   21,041.98x = 380,150,271.48
5. Step 5: Solve for x
   x = 380,150,271.48/21,041.98
6. Step 6: Final answer
   x = 18,066.28