Finding the Fourth Proportional to 21,041.61, 29,047.94 and 13,086.39

Step by Step Solution

1. Step 1: Write the proportion equation
   21,041.61 : 29,047.94 = 13,086.39 : x
2. Step 2: Convert to fraction form
   21,041.61/29,047.94 = 13,086.39/x
3. Step 3: Cross multiply
   21,041.61x = 29,047.94 × 13,086.39
4. Step 4: Simplify right side
   21,041.61x = 380,132,606.10
5. Step 5: Solve for x
   x = 380,132,606.10/21,041.61
6. Step 6: Final answer
   x = 18,065.76