Finding the Fourth Proportional to 12,391.91, 17,100.38 and 7,086.59

Step by Step Solution

1. Step 1: Write the proportion equation
   12,391.91 : 17,100.38 = 7,086.59 : x
2. Step 2: Convert to fraction form
   12,391.91/17,100.38 = 7,086.59/x
3. Step 3: Cross multiply
   12,391.91x = 17,100.38 × 7,086.59
4. Step 4: Simplify right side
   12,391.91x = 121,183,346.47
5. Step 5: Solve for x
   x = 121,183,346.47/12,391.91
6. Step 6: Final answer
   x = 9,779.23