Finding the Fourth Proportional to 1,368.99, 1,889.27 and 779.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,368.99 : 1,889.27 = 779.61 : x
2. Step 2: Convert to fraction form
   1,368.99/1,889.27 = 779.61/x
3. Step 3: Cross multiply
   1,368.99x = 1,889.27 × 779.61
4. Step 4: Simplify right side
   1,368.99x = 1,472,889.89
5. Step 5: Solve for x
   x = 1,472,889.89/1,368.99
6. Step 6: Final answer
   x = 1,075.90