Finding the Fourth Proportional to 1,116.42, 1,673.29 and 841.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,116.42 : 1,673.29 = 841.60 : x
2. Step 2: Convert to fraction form
   1,116.42/1,673.29 = 841.60/x
3. Step 3: Cross multiply
   1,116.42x = 1,673.29 × 841.60
4. Step 4: Simplify right side
   1,116.42x = 1,408,240.86
5. Step 5: Solve for x
   x = 1,408,240.86/1,116.42
6. Step 6: Final answer
   x = 1,261.39