Finding the Fourth Proportional to 20,856.48, 31,281 and 10,323.12

Step by Step Solution

1. Step 1: Write the proportion equation
   20,856.48 : 31,281 = 10,323.12 : x
2. Step 2: Convert to fraction form
   20,856.48/31,281 = 10,323.12/x
3. Step 3: Cross multiply
   20,856.48x = 31,281 × 10,323.12
4. Step 4: Simplify right side
   20,856.48x = 322,917,516.72
5. Step 5: Solve for x
   x = 322,917,516.72/20,856.48
6. Step 6: Final answer
   x = 15,482.84