Finding the Fourth Proportional to 1,342.80, 1,852.81 and 811.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,342.80 : 1,852.81 = 811.58 : x
2. Step 2: Convert to fraction form
   1,342.80/1,852.81 = 811.58/x
3. Step 3: Cross multiply
   1,342.80x = 1,852.81 × 811.58
4. Step 4: Simplify right side
   1,342.80x = 1,503,692.25
5. Step 5: Solve for x
   x = 1,503,692.25/1,342.80
6. Step 6: Final answer
   x = 1,119.82