Finding the Fourth Proportional to 10,215.27, 15,331.32 and 5,286.42

Step by Step Solution

1. Step 1: Write the proportion equation
   10,215.27 : 15,331.32 = 5,286.42 : x
2. Step 2: Convert to fraction form
   10,215.27/15,331.32 = 5,286.42/x
3. Step 3: Cross multiply
   10,215.27x = 15,331.32 × 5,286.42
4. Step 4: Simplify right side
   10,215.27x = 81,047,796.67
5. Step 5: Solve for x
   x = 81,047,796.67/10,215.27
6. Step 6: Final answer
   x = 7,933.98