Finding the Fourth Proportional to 19,105.29, 28,638.50 and 17,691.03

Step by Step Solution

1. Step 1: Write the proportion equation
   19,105.29 : 28,638.50 = 17,691.03 : x
2. Step 2: Convert to fraction form
   19,105.29/28,638.50 = 17,691.03/x
3. Step 3: Cross multiply
   19,105.29x = 28,638.50 × 17,691.03
4. Step 4: Simplify right side
   19,105.29x = 506,644,474.20
5. Step 5: Solve for x
   x = 506,644,474.20/19,105.29
6. Step 6: Final answer
   x = 26,518.54