Finding the Fourth Proportional to 12,456.05, 17,189.67 and 7,151.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,456.05 : 17,189.67 = 7,151.89 : x
2. Step 2: Convert to fraction form
   12,456.05/17,189.67 = 7,151.89/x
3. Step 3: Cross multiply
   12,456.05x = 17,189.67 × 7,151.89
4. Step 4: Simplify right side
   12,456.05x = 122,938,628.98
5. Step 5: Solve for x
   x = 122,938,628.98/12,456.05
6. Step 6: Final answer
   x = 9,869.79