Finding the Fourth Proportional to 3,939.98, 5,436.86 and 2,171.48

Step by Step Solution

1. Step 1: Write the proportion equation
   3,939.98 : 5,436.86 = 2,171.48 : x
2. Step 2: Convert to fraction form
   3,939.98/5,436.86 = 2,171.48/x
3. Step 3: Cross multiply
   3,939.98x = 5,436.86 × 2,171.48
4. Step 4: Simplify right side
   3,939.98x = 11,805,994.71
5. Step 5: Solve for x
   x = 11,805,994.71/3,939.98
6. Step 6: Final answer
   x = 2,996.46