Finding the Fourth Proportional to 19,128.31, 28,589.89 and 17,249.92

Step by Step Solution

1. Step 1: Write the proportion equation
   19,128.31 : 28,589.89 = 17,249.92 : x
2. Step 2: Convert to fraction form
   19,128.31/28,589.89 = 17,249.92/x
3. Step 3: Cross multiply
   19,128.31x = 28,589.89 × 17,249.92
4. Step 4: Simplify right side
   19,128.31x = 493,173,315.31
5. Step 5: Solve for x
   x = 493,173,315.31/19,128.31
6. Step 6: Final answer
   x = 25,782.38