Finding the Fourth Proportional to 10,211.83, 15,318.63 and 2,816.31

Step by Step Solution

1. Step 1: Write the proportion equation
   10,211.83 : 15,318.63 = 2,816.31 : x
2. Step 2: Convert to fraction form
   10,211.83/15,318.63 = 2,816.31/x
3. Step 3: Cross multiply
   10,211.83x = 15,318.63 × 2,816.31
4. Step 4: Simplify right side
   10,211.83x = 43,142,010.86
5. Step 5: Solve for x
   x = 43,142,010.86/10,211.83
6. Step 6: Final answer
   x = 4,224.71