Finding the Fourth Proportional to 21,271.29, 31,858.29 and 10,185.81

Step by Step Solution

1. Step 1: Write the proportion equation
   21,271.29 : 31,858.29 = 10,185.81 : x
2. Step 2: Convert to fraction form
   21,271.29/31,858.29 = 10,185.81/x
3. Step 3: Cross multiply
   21,271.29x = 31,858.29 × 10,185.81
4. Step 4: Simplify right side
   21,271.29x = 324,502,488.86
5. Step 5: Solve for x
   x = 324,502,488.86/21,271.29
6. Step 6: Final answer
   x = 15,255.42