Finding the Fourth Proportional to 2,072.94, 3,109.55 and 774.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,072.94 : 3,109.55 = 774.38 : x
2. Step 2: Convert to fraction form
   2,072.94/3,109.55 = 774.38/x
3. Step 3: Cross multiply
   2,072.94x = 3,109.55 × 774.38
4. Step 4: Simplify right side
   2,072.94x = 2,407,953.91
5. Step 5: Solve for x
   x = 2,407,953.91/2,072.94
6. Step 6: Final answer
   x = 1,161.61