Finding the Fourth Proportional to 2,178.54, 3,263.76 and 1,689.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,178.54 : 3,263.76 = 1,689.30 : x
2. Step 2: Convert to fraction form
   2,178.54/3,263.76 = 1,689.30/x
3. Step 3: Cross multiply
   2,178.54x = 3,263.76 × 1,689.30
4. Step 4: Simplify right side
   2,178.54x = 5,513,469.77
5. Step 5: Solve for x
   x = 5,513,469.77/2,178.54
6. Step 6: Final answer
   x = 2,530.81