Finding the Fourth Proportional to 10,215.69, 15,315.93 and 4,294.31

Step by Step Solution

1. Step 1: Write the proportion equation
   10,215.69 : 15,315.93 = 4,294.31 : x
2. Step 2: Convert to fraction form
   10,215.69/15,315.93 = 4,294.31/x
3. Step 3: Cross multiply
   10,215.69x = 15,315.93 × 4,294.31
4. Step 4: Simplify right side
   10,215.69x = 65,771,329.89
5. Step 5: Solve for x
   x = 65,771,329.89/10,215.69
6. Step 6: Final answer
   x = 6,438.27