Finding the Fourth Proportional to 1,395.47, 2,091.83 and 779.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,395.47 : 2,091.83 = 779.69 : x
2. Step 2: Convert to fraction form
   1,395.47/2,091.83 = 779.69/x
3. Step 3: Cross multiply
   1,395.47x = 2,091.83 × 779.69
4. Step 4: Simplify right side
   1,395.47x = 1,630,978.93
5. Step 5: Solve for x
   x = 1,630,978.93/1,395.47
6. Step 6: Final answer
   x = 1,168.77