Finding the Fourth Proportional to 10,215.05, 15,314.78 and 5,281.54

Step by Step Solution

1. Step 1: Write the proportion equation
   10,215.05 : 15,314.78 = 5,281.54 : x
2. Step 2: Convert to fraction form
   10,215.05/15,314.78 = 5,281.54/x
3. Step 3: Cross multiply
   10,215.05x = 15,314.78 × 5,281.54
4. Step 4: Simplify right side
   10,215.05x = 80,885,623.16
5. Step 5: Solve for x
   x = 80,885,623.16/10,215.05
6. Step 6: Final answer
   x = 7,918.28