Finding the Fourth Proportional to 1,371.55, 2,057.61 and 786.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,371.55 : 2,057.61 = 786.82 : x
2. Step 2: Convert to fraction form
   1,371.55/2,057.61 = 786.82/x
3. Step 3: Cross multiply
   1,371.55x = 2,057.61 × 786.82
4. Step 4: Simplify right side
   1,371.55x = 1,618,958.41
5. Step 5: Solve for x
   x = 1,618,958.41/1,371.55
6. Step 6: Final answer
   x = 1,180.39