Finding the Fourth Proportional to 21,871.86, 32,806.17 and 13,087.14

Step by Step Solution

1. Step 1: Write the proportion equation
   21,871.86 : 32,806.17 = 13,087.14 : x
2. Step 2: Convert to fraction form
   21,871.86/32,806.17 = 13,087.14/x
3. Step 3: Cross multiply
   21,871.86x = 32,806.17 × 13,087.14
4. Step 4: Simplify right side
   21,871.86x = 429,338,939.65
5. Step 5: Solve for x
   x = 429,338,939.65/21,871.86
6. Step 6: Final answer
   x = 19,629.74