Finding the Fourth Proportional to 4,789.90, 6,612.78 and 3,196.12

Step by Step Solution

1. Step 1: Write the proportion equation
   4,789.90 : 6,612.78 = 3,196.12 : x
2. Step 2: Convert to fraction form
   4,789.90/6,612.78 = 3,196.12/x
3. Step 3: Cross multiply
   4,789.90x = 6,612.78 × 3,196.12
4. Step 4: Simplify right side
   4,789.90x = 21,135,238.41
5. Step 5: Solve for x
   x = 21,135,238.41/4,789.90
6. Step 6: Final answer
   x = 4,412.46