Finding the Fourth Proportional to 1,443.02, 1,991.36 and 779.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.02 : 1,991.36 = 779.87 : x
2. Step 2: Convert to fraction form
   1,443.02/1,991.36 = 779.87/x
3. Step 3: Cross multiply
   1,443.02x = 1,991.36 × 779.87
4. Step 4: Simplify right side
   1,443.02x = 1,552,998.89
5. Step 5: Solve for x
   x = 1,552,998.89/1,443.02
6. Step 6: Final answer
   x = 1,076.22