Finding the Fourth Proportional to 1,338.74, 1,847.43 and 779.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,338.74 : 1,847.43 = 779.31 : x
2. Step 2: Convert to fraction form
   1,338.74/1,847.43 = 779.31/x
3. Step 3: Cross multiply
   1,338.74x = 1,847.43 × 779.31
4. Step 4: Simplify right side
   1,338.74x = 1,439,728.06
5. Step 5: Solve for x
   x = 1,439,728.06/1,338.74
6. Step 6: Final answer
   x = 1,075.43