Finding the Fourth Proportional to 1,338.94, 1,847.71 and 779.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,338.94 : 1,847.71 = 779.43 : x
2. Step 2: Convert to fraction form
   1,338.94/1,847.71 = 779.43/x
3. Step 3: Cross multiply
   1,338.94x = 1,847.71 × 779.43
4. Step 4: Simplify right side
   1,338.94x = 1,440,156.71
5. Step 5: Solve for x
   x = 1,440,156.71/1,338.94
6. Step 6: Final answer
   x = 1,075.60