Finding the Fourth Proportional to 2,616.81, 3,923.76 and 1,209.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,616.81 : 3,923.76 = 1,209.69 : x
2. Step 2: Convert to fraction form
   2,616.81/3,923.76 = 1,209.69/x
3. Step 3: Cross multiply
   2,616.81x = 3,923.76 × 1,209.69
4. Step 4: Simplify right side
   2,616.81x = 4,746,533.23
5. Step 5: Solve for x
   x = 4,746,533.23/2,616.81
6. Step 6: Final answer
   x = 1,813.86