Finding the Fourth Proportional to 21,410.28, 32,080.86 and 13,185

Step by Step Solution

1. Step 1: Write the proportion equation
   21,410.28 : 32,080.86 = 13,185 : x
2. Step 2: Convert to fraction form
   21,410.28/32,080.86 = 13,185/x
3. Step 3: Cross multiply
   21,410.28x = 32,080.86 × 13,185
4. Step 4: Simplify right side
   21,410.28x = 422,986,139.10
5. Step 5: Solve for x
   x = 422,986,139.10/21,410.28
6. Step 6: Final answer
   x = 19,756.22