Finding the Fourth Proportional to 1,180.82, 1,770.06 and 660.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,180.82 : 1,770.06 = 660.34 : x
2. Step 2: Convert to fraction form
   1,180.82/1,770.06 = 660.34/x
3. Step 3: Cross multiply
   1,180.82x = 1,770.06 × 660.34
4. Step 4: Simplify right side
   1,180.82x = 1,168,841.42
5. Step 5: Solve for x
   x = 1,168,841.42/1,180.82
6. Step 6: Final answer
   x = 989.86