Finding the Fourth Proportional to 12,856.28, 17,742.53 and 7,191.54

Step by Step Solution

1. Step 1: Write the proportion equation
   12,856.28 : 17,742.53 = 7,191.54 : x
2. Step 2: Convert to fraction form
   12,856.28/17,742.53 = 7,191.54/x
3. Step 3: Cross multiply
   12,856.28x = 17,742.53 × 7,191.54
4. Step 4: Simplify right side
   12,856.28x = 127,596,078.24
5. Step 5: Solve for x
   x = 127,596,078.24/12,856.28
6. Step 6: Final answer
   x = 9,924.81