Finding the Fourth Proportional to 8,128.90, 12,181.83 and 4,612.42

Step by Step Solution

1. Step 1: Write the proportion equation
   8,128.90 : 12,181.83 = 4,612.42 : x
2. Step 2: Convert to fraction form
   8,128.90/12,181.83 = 4,612.42/x
3. Step 3: Cross multiply
   8,128.90x = 12,181.83 × 4,612.42
4. Step 4: Simplify right side
   8,128.90x = 56,187,716.33
5. Step 5: Solve for x
   x = 56,187,716.33/8,128.90
6. Step 6: Final answer
   x = 6,912.09