Finding the Fourth Proportional to 12,806.59, 19,215.69 and 5,782.81

Step by Step Solution

1. Step 1: Write the proportion equation
   12,806.59 : 19,215.69 = 5,782.81 : x
2. Step 2: Convert to fraction form
   12,806.59/19,215.69 = 5,782.81/x
3. Step 3: Cross multiply
   12,806.59x = 19,215.69 × 5,782.81
4. Step 4: Simplify right side
   12,806.59x = 111,120,684.29
5. Step 5: Solve for x
   x = 111,120,684.29/12,806.59
6. Step 6: Final answer
   x = 8,676.84