Finding the Fourth Proportional to 6,726.78, 10,091.79 and 2,109.78

Step by Step Solution

1. Step 1: Write the proportion equation
   6,726.78 : 10,091.79 = 2,109.78 : x
2. Step 2: Convert to fraction form
   6,726.78/10,091.79 = 2,109.78/x
3. Step 3: Cross multiply
   6,726.78x = 10,091.79 × 2,109.78
4. Step 4: Simplify right side
   6,726.78x = 21,291,456.71
5. Step 5: Solve for x
   x = 21,291,456.71/6,726.78
6. Step 6: Final answer
   x = 3,165.18