Finding the Fourth Proportional to 1,854.69, 2,779.63 and 1,388.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,854.69 : 2,779.63 = 1,388.82 : x
2. Step 2: Convert to fraction form
   1,854.69/2,779.63 = 1,388.82/x
3. Step 3: Cross multiply
   1,854.69x = 2,779.63 × 1,388.82
4. Step 4: Simplify right side
   1,854.69x = 3,860,405.74
5. Step 5: Solve for x
   x = 3,860,405.74/1,854.69
6. Step 6: Final answer
   x = 2,081.43