Finding the Fourth Proportional to 10,215.07, 15,317.82 and 4,290.71

Step by Step Solution

1. Step 1: Write the proportion equation
   10,215.07 : 15,317.82 = 4,290.71 : x
2. Step 2: Convert to fraction form
   10,215.07/15,317.82 = 4,290.71/x
3. Step 3: Cross multiply
   10,215.07x = 15,317.82 × 4,290.71
4. Step 4: Simplify right side
   10,215.07x = 65,724,246.86
5. Step 5: Solve for x
   x = 65,724,246.86/10,215.07
6. Step 6: Final answer
   x = 6,434.05