Finding the Fourth Proportional to 1,770.36, 2,665.83 and 1,311.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,770.36 : 2,665.83 = 1,311.39 : x
2. Step 2: Convert to fraction form
   1,770.36/2,665.83 = 1,311.39/x
3. Step 3: Cross multiply
   1,770.36x = 2,665.83 × 1,311.39
4. Step 4: Simplify right side
   1,770.36x = 3,495,942.80
5. Step 5: Solve for x
   x = 3,495,942.80/1,770.36
6. Step 6: Final answer
   x = 1,974.71