Finding the Fourth Proportional to 12,456.72, 17,189.64 and 7,151.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,456.72 : 17,189.64 = 7,151.76 : x
2. Step 2: Convert to fraction form
   12,456.72/17,189.64 = 7,151.76/x
3. Step 3: Cross multiply
   12,456.72x = 17,189.64 × 7,151.76
4. Step 4: Simplify right side
   12,456.72x = 122,936,179.77
5. Step 5: Solve for x
   x = 122,936,179.77/12,456.72
6. Step 6: Final answer
   x = 9,869.07