Finding the Fourth Proportional to 1,339.43, 1,847.96 and 779.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,339.43 : 1,847.96 = 779.61 : x
2. Step 2: Convert to fraction form
   1,339.43/1,847.96 = 779.61/x
3. Step 3: Cross multiply
   1,339.43x = 1,847.96 × 779.61
4. Step 4: Simplify right side
   1,339.43x = 1,440,684.20
5. Step 5: Solve for x
   x = 1,440,684.20/1,339.43
6. Step 6: Final answer
   x = 1,075.60