Finding the Fourth Proportional to 2,153.94, 3,231.72 and 856.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,153.94 : 3,231.72 = 856.32 : x
2. Step 2: Convert to fraction form
   2,153.94/3,231.72 = 856.32/x
3. Step 3: Cross multiply
   2,153.94x = 3,231.72 × 856.32
4. Step 4: Simplify right side
   2,153.94x = 2,767,386.47
5. Step 5: Solve for x
   x = 2,767,386.47/2,153.94
6. Step 6: Final answer
   x = 1,284.80