Finding the Fourth Proportional to 8,383.91, 12,580.47 and 5,099.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,383.91 : 12,580.47 = 5,099.31 : x
2. Step 2: Convert to fraction form
   8,383.91/12,580.47 = 5,099.31/x
3. Step 3: Cross multiply
   8,383.91x = 12,580.47 × 5,099.31
4. Step 4: Simplify right side
   8,383.91x = 64,151,716.48
5. Step 5: Solve for x
   x = 64,151,716.48/8,383.91
6. Step 6: Final answer
   x = 7,651.77