Finding the Fourth Proportional to 2,790.67, 4,187.72 and 1,147.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,790.67 : 4,187.72 = 1,147.23 : x
2. Step 2: Convert to fraction form
   2,790.67/4,187.72 = 1,147.23/x
3. Step 3: Cross multiply
   2,790.67x = 4,187.72 × 1,147.23
4. Step 4: Simplify right side
   2,790.67x = 4,804,278.02
5. Step 5: Solve for x
   x = 4,804,278.02/2,790.67
6. Step 6: Final answer
   x = 1,721.55