Finding the Fourth Proportional to 1,338.89, 1,847.63 and 779.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,338.89 : 1,847.63 = 779.58 : x
2. Step 2: Convert to fraction form
   1,338.89/1,847.63 = 779.58/x
3. Step 3: Cross multiply
   1,338.89x = 1,847.63 × 779.58
4. Step 4: Simplify right side
   1,338.89x = 1,440,371.50
5. Step 5: Solve for x
   x = 1,440,371.50/1,338.89
6. Step 6: Final answer
   x = 1,075.80