Finding the Fourth Proportional to 12,391, 17,101.74 and 7,086.04

Step by Step Solution

1. Step 1: Write the proportion equation
   12,391 : 17,101.74 = 7,086.04 : x
2. Step 2: Convert to fraction form
   12,391/17,101.74 = 7,086.04/x
3. Step 3: Cross multiply
   12,391x = 17,101.74 × 7,086.04
4. Step 4: Simplify right side
   12,391x = 121,183,613.71
5. Step 5: Solve for x
   x = 121,183,613.71/12,391
6. Step 6: Final answer
   x = 9,779.97