Finding the Fourth Proportional to 1,211.42, 1,672.06 and 791.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,211.42 : 1,672.06 = 791.06 : x
2. Step 2: Convert to fraction form
   1,211.42/1,672.06 = 791.06/x
3. Step 3: Cross multiply
   1,211.42x = 1,672.06 × 791.06
4. Step 4: Simplify right side
   1,211.42x = 1,322,699.78
5. Step 5: Solve for x
   x = 1,322,699.78/1,211.42
6. Step 6: Final answer
   x = 1,091.86