Finding the Fourth Proportional to 1,395.71, 2,092.38 and 779.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,395.71 : 2,092.38 = 779.61 : x
2. Step 2: Convert to fraction form
   1,395.71/2,092.38 = 779.61/x
3. Step 3: Cross multiply
   1,395.71x = 2,092.38 × 779.61
4. Step 4: Simplify right side
   1,395.71x = 1,631,240.37
5. Step 5: Solve for x
   x = 1,631,240.37/1,395.71
6. Step 6: Final answer
   x = 1,168.75