Finding the Fourth Proportional to 21,160.59, 31,697.83 and 13,742.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,160.59 : 31,697.83 = 13,742.56 : x
2. Step 2: Convert to fraction form
   21,160.59/31,697.83 = 13,742.56/x
3. Step 3: Cross multiply
   21,160.59x = 31,697.83 × 13,742.56
4. Step 4: Simplify right side
   21,160.59x = 435,609,387.45
5. Step 5: Solve for x
   x = 435,609,387.45/21,160.59
6. Step 6: Final answer
   x = 20,585.88