Finding the Fourth Proportional to 7,238.86, 10,856.31 and 2,856.22

Step by Step Solution

1. Step 1: Write the proportion equation
   7,238.86 : 10,856.31 = 2,856.22 : x
2. Step 2: Convert to fraction form
   7,238.86/10,856.31 = 2,856.22/x
3. Step 3: Cross multiply
   7,238.86x = 10,856.31 × 2,856.22
4. Step 4: Simplify right side
   7,238.86x = 31,008,009.75
5. Step 5: Solve for x
   x = 31,008,009.75/7,238.86
6. Step 6: Final answer
   x = 4,283.55