Finding the Fourth Proportional to 1,339.15, 1,847.96 and 779.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,339.15 : 1,847.96 = 779.59 : x
2. Step 2: Convert to fraction form
   1,339.15/1,847.96 = 779.59/x
3. Step 3: Cross multiply
   1,339.15x = 1,847.96 × 779.59
4. Step 4: Simplify right side
   1,339.15x = 1,440,651.14
5. Step 5: Solve for x
   x = 1,440,651.14/1,339.15
6. Step 6: Final answer
   x = 1,075.80