Finding the Fourth Proportional to 14,396, 21,594.72 and 13,638.56

Step by Step Solution

1. Step 1: Write the proportion equation
   14,396 : 21,594.72 = 13,638.56 : x
2. Step 2: Convert to fraction form
   14,396/21,594.72 = 13,638.56/x
3. Step 3: Cross multiply
   14,396x = 21,594.72 × 13,638.56
4. Step 4: Simplify right side
   14,396x = 294,520,884.40
5. Step 5: Solve for x
   x = 294,520,884.40/14,396
6. Step 6: Final answer
   x = 20,458.52