Finding the Fourth Proportional to 2,072.69, 3,109.18 and 774.13

Step by Step Solution

1. Step 1: Write the proportion equation
   2,072.69 : 3,109.18 = 774.13 : x
2. Step 2: Convert to fraction form
   2,072.69/3,109.18 = 774.13/x
3. Step 3: Cross multiply
   2,072.69x = 3,109.18 × 774.13
4. Step 4: Simplify right side
   2,072.69x = 2,406,905.64
5. Step 5: Solve for x
   x = 2,406,905.64/2,072.69
6. Step 6: Final answer
   x = 1,161.25