Finding the Fourth Proportional to 1,556.42, 2,146.82 and 1,224.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,556.42 : 2,146.82 = 1,224.72 : x
2. Step 2: Convert to fraction form
   1,556.42/2,146.82 = 1,224.72/x
3. Step 3: Cross multiply
   1,556.42x = 2,146.82 × 1,224.72
4. Step 4: Simplify right side
   1,556.42x = 2,629,247.27
5. Step 5: Solve for x
   x = 2,629,247.27/1,556.42
6. Step 6: Final answer
   x = 1,689.30