Finding the Fourth Proportional to 1,377.68, 1,900.80 and 818.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.68 : 1,900.80 = 818.10 : x
2. Step 2: Convert to fraction form
   1,377.68/1,900.80 = 818.10/x
3. Step 3: Cross multiply
   1,377.68x = 1,900.80 × 818.10
4. Step 4: Simplify right side
   1,377.68x = 1,555,044.48
5. Step 5: Solve for x
   x = 1,555,044.48/1,377.68
6. Step 6: Final answer
   x = 1,128.75