Finding the Fourth Proportional to 1,370.77, 1,890.69 and 811.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,370.77 : 1,890.69 = 811.27 : x
2. Step 2: Convert to fraction form
   1,370.77/1,890.69 = 811.27/x
3. Step 3: Cross multiply
   1,370.77x = 1,890.69 × 811.27
4. Step 4: Simplify right side
   1,370.77x = 1,533,853.33
5. Step 5: Solve for x
   x = 1,533,853.33/1,370.77
6. Step 6: Final answer
   x = 1,118.97