Finding the Fourth Proportional to 25,511.34, 38,209.31 and 13,644.15

Step by Step Solution

1. Step 1: Write the proportion equation
   25,511.34 : 38,209.31 = 13,644.15 : x
2. Step 2: Convert to fraction form
   25,511.34/38,209.31 = 13,644.15/x
3. Step 3: Cross multiply
   25,511.34x = 38,209.31 × 13,644.15
4. Step 4: Simplify right side
   25,511.34x = 521,333,488.82
5. Step 5: Solve for x
   x = 521,333,488.82/25,511.34
6. Step 6: Final answer
   x = 20,435.36