Finding the Fourth Proportional to 21,957.62, 30,298.25 and 13,339.31

Step by Step Solution

1. Step 1: Write the proportion equation
   21,957.62 : 30,298.25 = 13,339.31 : x
2. Step 2: Convert to fraction form
   21,957.62/30,298.25 = 13,339.31/x
3. Step 3: Cross multiply
   21,957.62x = 30,298.25 × 13,339.31
4. Step 4: Simplify right side
   21,957.62x = 404,157,758.26
5. Step 5: Solve for x
   x = 404,157,758.26/21,957.62
6. Step 6: Final answer
   x = 18,406.27