Finding the Fourth Proportional to 12,648.33, 18,978.57 and 6,804.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,648.33 : 18,978.57 = 6,804.18 : x
2. Step 2: Convert to fraction form
   12,648.33/18,978.57 = 6,804.18/x
3. Step 3: Cross multiply
   12,648.33x = 18,978.57 × 6,804.18
4. Step 4: Simplify right side
   12,648.33x = 129,133,606.42
5. Step 5: Solve for x
   x = 129,133,606.42/12,648.33
6. Step 6: Final answer
   x = 10,209.54