Finding the Fourth Proportional to 1,854.41, 2,779.21 and 1,388.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,854.41 : 2,779.21 = 1,388.53 : x
2. Step 2: Convert to fraction form
   1,854.41/2,779.21 = 1,388.53/x
3. Step 3: Cross multiply
   1,854.41x = 2,779.21 × 1,388.53
4. Step 4: Simplify right side
   1,854.41x = 3,859,016.46
5. Step 5: Solve for x
   x = 3,859,016.46/1,854.41
6. Step 6: Final answer
   x = 2,080.99