Finding the Fourth Proportional to 3,927.89, 5,420.33 and 2,159.48

Step by Step Solution

1. Step 1: Write the proportion equation
   3,927.89 : 5,420.33 = 2,159.48 : x
2. Step 2: Convert to fraction form
   3,927.89/5,420.33 = 2,159.48/x
3. Step 3: Cross multiply
   3,927.89x = 5,420.33 × 2,159.48
4. Step 4: Simplify right side
   3,927.89x = 11,705,086.74
5. Step 5: Solve for x
   x = 11,705,086.74/3,927.89
6. Step 6: Final answer
   x = 2,979.99