Finding the Fourth Proportional to 15,379.42, 23,057.37 and 12,738.82

Step by Step Solution

1. Step 1: Write the proportion equation
   15,379.42 : 23,057.37 = 12,738.82 : x
2. Step 2: Convert to fraction form
   15,379.42/23,057.37 = 12,738.82/x
3. Step 3: Cross multiply
   15,379.42x = 23,057.37 × 12,738.82
4. Step 4: Simplify right side
   15,379.42x = 293,723,686.10
5. Step 5: Solve for x
   x = 293,723,686.10/15,379.42
6. Step 6: Final answer
   x = 19,098.49