Finding the Fourth Proportional to 21,418.28, 32,164.17 and 13,146.86

Step by Step Solution

1. Step 1: Write the proportion equation
   21,418.28 : 32,164.17 = 13,146.86 : x
2. Step 2: Convert to fraction form
   21,418.28/32,164.17 = 13,146.86/x
3. Step 3: Cross multiply
   21,418.28x = 32,164.17 × 13,146.86
4. Step 4: Simplify right side
   21,418.28x = 422,857,840.01
5. Step 5: Solve for x
   x = 422,857,840.01/21,418.28
6. Step 6: Final answer
   x = 19,742.85