Finding the Fourth Proportional to 1,368.69, 1,888.83 and 779.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,368.69 : 1,888.83 = 779.21 : x
2. Step 2: Convert to fraction form
   1,368.69/1,888.83 = 779.21/x
3. Step 3: Cross multiply
   1,368.69x = 1,888.83 × 779.21
4. Step 4: Simplify right side
   1,368.69x = 1,471,795.22
5. Step 5: Solve for x
   x = 1,471,795.22/1,368.69
6. Step 6: Final answer
   x = 1,075.33