Finding the Fourth Proportional to 1,779.14, 2,665.29 and 1,387.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,779.14 : 2,665.29 = 1,387.31 : x
2. Step 2: Convert to fraction form
   1,779.14/2,665.29 = 1,387.31/x
3. Step 3: Cross multiply
   1,779.14x = 2,665.29 × 1,387.31
4. Step 4: Simplify right side
   1,779.14x = 3,697,583.47
5. Step 5: Solve for x
   x = 3,697,583.47/1,779.14
6. Step 6: Final answer
   x = 2,078.30