Finding the Fourth Proportional to 20,982.01, 28,958.69 and 13,427.98

Step by Step Solution

1. Step 1: Write the proportion equation
   20,982.01 : 28,958.69 = 13,427.98 : x
2. Step 2: Convert to fraction form
   20,982.01/28,958.69 = 13,427.98/x
3. Step 3: Cross multiply
   20,982.01x = 28,958.69 × 13,427.98
4. Step 4: Simplify right side
   20,982.01x = 388,856,633.55
5. Step 5: Solve for x
   x = 388,856,633.55/20,982.01
6. Step 6: Final answer
   x = 18,532.86