Finding the Fourth Proportional to 1,368.82, 1,889.20 and 779.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,368.82 : 1,889.20 = 779.55 : x
2. Step 2: Convert to fraction form
   1,368.82/1,889.20 = 779.55/x
3. Step 3: Cross multiply
   1,368.82x = 1,889.20 × 779.55
4. Step 4: Simplify right side
   1,368.82x = 1,472,725.86
5. Step 5: Solve for x
   x = 1,472,725.86/1,368.82
6. Step 6: Final answer
   x = 1,075.91