Finding the Fourth Proportional to 13,789.59, 20,528.42 and 13,707.58

Step by Step Solution

1. Step 1: Write the proportion equation
   13,789.59 : 20,528.42 = 13,707.58 : x
2. Step 2: Convert to fraction form
   13,789.59/20,528.42 = 13,707.58/x
3. Step 3: Cross multiply
   13,789.59x = 20,528.42 × 13,707.58
4. Step 4: Simplify right side
   13,789.59x = 281,394,959.42
5. Step 5: Solve for x
   x = 281,394,959.42/13,789.59
6. Step 6: Final answer
   x = 20,406.33