Finding the Fourth Proportional to 21,074.28, 29,087.82 and 13,900.92

Step by Step Solution

1. Step 1: Write the proportion equation
   21,074.28 : 29,087.82 = 13,900.92 : x
2. Step 2: Convert to fraction form
   21,074.28/29,087.82 = 13,900.92/x
3. Step 3: Cross multiply
   21,074.28x = 29,087.82 × 13,900.92
4. Step 4: Simplify right side
   21,074.28x = 404,347,458.79
5. Step 5: Solve for x
   x = 404,347,458.79/21,074.28
6. Step 6: Final answer
   x = 19,186.77