Finding the Fourth Proportional to 1,431.12, 1,974.72 and 841.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,431.12 : 1,974.72 = 841.56 : x
2. Step 2: Convert to fraction form
   1,431.12/1,974.72 = 841.56/x
3. Step 3: Cross multiply
   1,431.12x = 1,974.72 × 841.56
4. Step 4: Simplify right side
   1,431.12x = 1,661,845.36
5. Step 5: Solve for x
   x = 1,661,845.36/1,431.12
6. Step 6: Final answer
   x = 1,161.22