Finding the Fourth Proportional to 1,560.42, 2,339.94 and 779.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,560.42 : 2,339.94 = 779.82 : x
2. Step 2: Convert to fraction form
   1,560.42/2,339.94 = 779.82/x
3. Step 3: Cross multiply
   1,560.42x = 2,339.94 × 779.82
4. Step 4: Simplify right side
   1,560.42x = 1,824,732.01
5. Step 5: Solve for x
   x = 1,824,732.01/1,560.42
6. Step 6: Final answer
   x = 1,169.39