Finding the Fourth Proportional to 1,377.74, 1,901.08 and 818.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.74 : 1,901.08 = 818.20 : x
2. Step 2: Convert to fraction form
   1,377.74/1,901.08 = 818.20/x
3. Step 3: Cross multiply
   1,377.74x = 1,901.08 × 818.20
4. Step 4: Simplify right side
   1,377.74x = 1,555,457.01
5. Step 5: Solve for x
   x = 1,555,457.01/1,377.74
6. Step 6: Final answer
   x = 1,128.99