Finding the Fourth Proportional to 8,383.59, 12,579.03 and 5,790.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,383.59 : 12,579.03 = 5,790.78 : x
2. Step 2: Convert to fraction form
   8,383.59/12,579.03 = 5,790.78/x
3. Step 3: Cross multiply
   8,383.59x = 12,579.03 × 5,790.78
4. Step 4: Simplify right side
   8,383.59x = 72,842,395.34
5. Step 5: Solve for x
   x = 72,842,395.34/8,383.59
6. Step 6: Final answer
   x = 8,688.69