Finding the Fourth Proportional to 1,310.71, 1,811.37 and 1,074.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,310.71 : 1,811.37 = 1,074.28 : x
2. Step 2: Convert to fraction form
   1,310.71/1,811.37 = 1,074.28/x
3. Step 3: Cross multiply
   1,310.71x = 1,811.37 × 1,074.28
4. Step 4: Simplify right side
   1,310.71x = 1,945,918.56
5. Step 5: Solve for x
   x = 1,945,918.56/1,310.71
6. Step 6: Final answer
   x = 1,484.63