Finding the Fourth Proportional to 21,974.56, 32,879.52 and 13,057.40

Step by Step Solution

1. Step 1: Write the proportion equation
   21,974.56 : 32,879.52 = 13,057.40 : x
2. Step 2: Convert to fraction form
   21,974.56/32,879.52 = 13,057.40/x
3. Step 3: Cross multiply
   21,974.56x = 32,879.52 × 13,057.40
4. Step 4: Simplify right side
   21,974.56x = 429,321,126.65
5. Step 5: Solve for x
   x = 429,321,126.65/21,974.56
6. Step 6: Final answer
   x = 19,537.19