Finding the Fourth Proportional to 1,366.45, 1,885.17 and 841.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,366.45 : 1,885.17 = 841.57 : x
2. Step 2: Convert to fraction form
   1,366.45/1,885.17 = 841.57/x
3. Step 3: Cross multiply
   1,366.45x = 1,885.17 × 841.57
4. Step 4: Simplify right side
   1,366.45x = 1,586,501.72
5. Step 5: Solve for x
   x = 1,586,501.72/1,366.45
6. Step 6: Final answer
   x = 1,161.04