Finding the Fourth Proportional to 1,338.84, 1,847.43 and 779.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,338.84 : 1,847.43 = 779.49 : x
2. Step 2: Convert to fraction form
   1,338.84/1,847.43 = 779.49/x
3. Step 3: Cross multiply
   1,338.84x = 1,847.43 × 779.49
4. Step 4: Simplify right side
   1,338.84x = 1,440,053.21
5. Step 5: Solve for x
   x = 1,440,053.21/1,338.84
6. Step 6: Final answer
   x = 1,075.60