Finding the Fourth Proportional to 10,390.69, 15,596.43 and 5,470.71

Step by Step Solution

1. Step 1: Write the proportion equation
   10,390.69 : 15,596.43 = 5,470.71 : x
2. Step 2: Convert to fraction form
   10,390.69/15,596.43 = 5,470.71/x
3. Step 3: Cross multiply
   10,390.69x = 15,596.43 × 5,470.71
4. Step 4: Simplify right side
   10,390.69x = 85,323,545.57
5. Step 5: Solve for x
   x = 85,323,545.57/10,390.69
6. Step 6: Final answer
   x = 8,211.54