Finding the Fourth Proportional to 1,291.23, 1,782.72 and 849.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,291.23 : 1,782.72 = 849.89 : x
2. Step 2: Convert to fraction form
   1,291.23/1,782.72 = 849.89/x
3. Step 3: Cross multiply
   1,291.23x = 1,782.72 × 849.89
4. Step 4: Simplify right side
   1,291.23x = 1,515,120.36
5. Step 5: Solve for x
   x = 1,515,120.36/1,291.23
6. Step 6: Final answer
   x = 1,173.39