Finding the Fourth Proportional to 10,389.57, 15,585.51 and 3,815.76

Step by Step Solution

1. Step 1: Write the proportion equation
   10,389.57 : 15,585.51 = 3,815.76 : x
2. Step 2: Convert to fraction form
   10,389.57/15,585.51 = 3,815.76/x
3. Step 3: Cross multiply
   10,389.57x = 15,585.51 × 3,815.76
4. Step 4: Simplify right side
   10,389.57x = 59,470,550.72
5. Step 5: Solve for x
   x = 59,470,550.72/10,389.57
6. Step 6: Final answer
   x = 5,724.06