Finding the Fourth Proportional to 1,853.19, 2,556.28 and 1,223.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,853.19 : 2,556.28 = 1,223.73 : x
2. Step 2: Convert to fraction form
   1,853.19/2,556.28 = 1,223.73/x
3. Step 3: Cross multiply
   1,853.19x = 2,556.28 × 1,223.73
4. Step 4: Simplify right side
   1,853.19x = 3,128,196.52
5. Step 5: Solve for x
   x = 3,128,196.52/1,853.19
6. Step 6: Final answer
   x = 1,688.01