Finding the Fourth Proportional to 1,395.72, 2,094.69 and 779.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,395.72 : 2,094.69 = 779.31 : x
2. Step 2: Convert to fraction form
   1,395.72/2,094.69 = 779.31/x
3. Step 3: Cross multiply
   1,395.72x = 2,094.69 × 779.31
4. Step 4: Simplify right side
   1,395.72x = 1,632,412.86
5. Step 5: Solve for x
   x = 1,632,412.86/1,395.72
6. Step 6: Final answer
   x = 1,169.58