Finding the Fourth Proportional to 1,809.27, 2,487.20 and 1,556.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,809.27 : 2,487.20 = 1,556.28 : x
2. Step 2: Convert to fraction form
   1,809.27/2,487.20 = 1,556.28/x
3. Step 3: Cross multiply
   1,809.27x = 2,487.20 × 1,556.28
4. Step 4: Simplify right side
   1,809.27x = 3,870,771.83
5. Step 5: Solve for x
   x = 3,870,771.83/1,809.27
6. Step 6: Final answer
   x = 2,139.41