Finding the Fourth Proportional to 3,939.78, 5,437.89 and 2,368.80

Step by Step Solution

1. Step 1: Write the proportion equation
   3,939.78 : 5,437.89 = 2,368.80 : x
2. Step 2: Convert to fraction form
   3,939.78/5,437.89 = 2,368.80/x
3. Step 3: Cross multiply
   3,939.78x = 5,437.89 × 2,368.80
4. Step 4: Simplify right side
   3,939.78x = 12,881,273.83
5. Step 5: Solve for x
   x = 12,881,273.83/3,939.78
6. Step 6: Final answer
   x = 3,269.54