Finding the Fourth Proportional to 1,368.63, 1,888.61 and 779.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,368.63 : 1,888.61 = 779.09 : x
2. Step 2: Convert to fraction form
   1,368.63/1,888.61 = 779.09/x
3. Step 3: Cross multiply
   1,368.63x = 1,888.61 × 779.09
4. Step 4: Simplify right side
   1,368.63x = 1,471,383.83
5. Step 5: Solve for x
   x = 1,471,383.83/1,368.63
6. Step 6: Final answer
   x = 1,075.08