Finding the Fourth Proportional to 1,442.15, 1,990.17 and 779.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,442.15 : 1,990.17 = 779.00 : x
2. Step 2: Convert to fraction form
   1,442.15/1,990.17 = 779.00/x
3. Step 3: Cross multiply
   1,442.15x = 1,990.17 × 779.00
4. Step 4: Simplify right side
   1,442.15x = 1,550,345.46
5. Step 5: Solve for x
   x = 1,550,345.46/1,442.15
6. Step 6: Final answer
   x = 1,075.02