Finding the Fourth Proportional to 1,431.30, 1,974.42 and 841.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,431.30 : 1,974.42 = 841.74 : x
2. Step 2: Convert to fraction form
   1,431.30/1,974.42 = 841.74/x
3. Step 3: Cross multiply
   1,431.30x = 1,974.42 × 841.74
4. Step 4: Simplify right side
   1,431.30x = 1,661,948.29
5. Step 5: Solve for x
   x = 1,661,948.29/1,431.30
6. Step 6: Final answer
   x = 1,161.15