Finding the Fourth Proportional to 13,978.83, 19,286.96 and 9,725.12

Step by Step Solution

1. Step 1: Write the proportion equation
   13,978.83 : 19,286.96 = 9,725.12 : x
2. Step 2: Convert to fraction form
   13,978.83/19,286.96 = 9,725.12/x
3. Step 3: Cross multiply
   13,978.83x = 19,286.96 × 9,725.12
4. Step 4: Simplify right side
   13,978.83x = 187,568,000.44
5. Step 5: Solve for x
   x = 187,568,000.44/13,978.83
6. Step 6: Final answer
   x = 13,418.00