Finding the Fourth Proportional to 2,178.38, 3,259.72 and 1,889.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,178.38 : 3,259.72 = 1,889.31 : x
2. Step 2: Convert to fraction form
   2,178.38/3,259.72 = 1,889.31/x
3. Step 3: Cross multiply
   2,178.38x = 3,259.72 × 1,889.31
4. Step 4: Simplify right side
   2,178.38x = 6,158,621.59
5. Step 5: Solve for x
   x = 6,158,621.59/2,178.38
6. Step 6: Final answer
   x = 2,827.16