Finding the Fourth Proportional to 7,815.83, 10,786.41 and 5,158.62

Step by Step Solution

1. Step 1: Write the proportion equation
   7,815.83 : 10,786.41 = 5,158.62 : x
2. Step 2: Convert to fraction form
   7,815.83/10,786.41 = 5,158.62/x
3. Step 3: Cross multiply
   7,815.83x = 10,786.41 × 5,158.62
4. Step 4: Simplify right side
   7,815.83x = 55,642,990.35
5. Step 5: Solve for x
   x = 55,642,990.35/7,815.83
6. Step 6: Final answer
   x = 7,119.27