Finding the Fourth Proportional to 1,377.40, 1,900.87 and 818.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.40 : 1,900.87 = 818.18 : x
2. Step 2: Convert to fraction form
   1,377.40/1,900.87 = 818.18/x
3. Step 3: Cross multiply
   1,377.40x = 1,900.87 × 818.18
4. Step 4: Simplify right side
   1,377.40x = 1,555,253.82
5. Step 5: Solve for x
   x = 1,555,253.82/1,377.40
6. Step 6: Final answer
   x = 1,129.12