Finding the Fourth Proportional to 1,556.89, 2,147.11 and 1,224.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,556.89 : 2,147.11 = 1,224.72 : x
2. Step 2: Convert to fraction form
   1,556.89/2,147.11 = 1,224.72/x
3. Step 3: Cross multiply
   1,556.89x = 2,147.11 × 1,224.72
4. Step 4: Simplify right side
   1,556.89x = 2,629,605.50
5. Step 5: Solve for x
   x = 2,629,605.50/1,556.89
6. Step 6: Final answer
   x = 1,689.01