Finding the Fourth Proportional to 19,401.42, 29,143.60 and 13,890.18

Step by Step Solution

1. Step 1: Write the proportion equation
   19,401.42 : 29,143.60 = 13,890.18 : x
2. Step 2: Convert to fraction form
   19,401.42/29,143.60 = 13,890.18/x
3. Step 3: Cross multiply
   19,401.42x = 29,143.60 × 13,890.18
4. Step 4: Simplify right side
   19,401.42x = 404,809,924.41
5. Step 5: Solve for x
   x = 404,809,924.41/19,401.42
6. Step 6: Final answer
   x = 20,864.96