Finding the Fourth Proportional to 21,040.32, 29,050.32 and 13,086.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,040.32 : 29,050.32 = 13,086.12 : x
2. Step 2: Convert to fraction form
   21,040.32/29,050.32 = 13,086.12/x
3. Step 3: Cross multiply
   21,040.32x = 29,050.32 × 13,086.12
4. Step 4: Simplify right side
   21,040.32x = 380,155,973.56
5. Step 5: Solve for x
   x = 380,155,973.56/21,040.32
6. Step 6: Final answer
   x = 18,067.97