Finding the Fourth Proportional to 1,368.88, 1,889.22 and 779.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,368.88 : 1,889.22 = 779.56 : x
2. Step 2: Convert to fraction form
   1,368.88/1,889.22 = 779.56/x
3. Step 3: Cross multiply
   1,368.88x = 1,889.22 × 779.56
4. Step 4: Simplify right side
   1,368.88x = 1,472,760.34
5. Step 5: Solve for x
   x = 1,472,760.34/1,368.88
6. Step 6: Final answer
   x = 1,075.89