Finding the Fourth Proportional to 12,856.94, 17,742.02 and 8,081.79

Step by Step Solution

1. Step 1: Write the proportion equation
   12,856.94 : 17,742.02 = 8,081.79 : x
2. Step 2: Convert to fraction form
   12,856.94/17,742.02 = 8,081.79/x
3. Step 3: Cross multiply
   12,856.94x = 17,742.02 × 8,081.79
4. Step 4: Simplify right side
   12,856.94x = 143,387,172.87
5. Step 5: Solve for x
   x = 143,387,172.87/12,856.94
6. Step 6: Final answer
   x = 11,152.51