Finding the Fourth Proportional to 12,972.69, 17,890.07 and 8,500.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,972.69 : 17,890.07 = 8,500.28 : x
2. Step 2: Convert to fraction form
   12,972.69/17,890.07 = 8,500.28/x
3. Step 3: Cross multiply
   12,972.69x = 17,890.07 × 8,500.28
4. Step 4: Simplify right side
   12,972.69x = 152,070,472.27
5. Step 5: Solve for x
   x = 152,070,472.27/12,972.69
6. Step 6: Final answer
   x = 11,722.35