Finding the Fourth Proportional to 1,368.92, 1,888.89 and 779.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,368.92 : 1,888.89 = 779.47 : x
2. Step 2: Convert to fraction form
   1,368.92/1,888.89 = 779.47/x
3. Step 3: Cross multiply
   1,368.92x = 1,888.89 × 779.47
4. Step 4: Simplify right side
   1,368.92x = 1,472,333.09
5. Step 5: Solve for x
   x = 1,472,333.09/1,368.92
6. Step 6: Final answer
   x = 1,075.54