Finding the Fourth Proportional to 1,298.63, 1,791.99 and 774.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,298.63 : 1,791.99 = 774.56 : x
2. Step 2: Convert to fraction form
   1,298.63/1,791.99 = 774.56/x
3. Step 3: Cross multiply
   1,298.63x = 1,791.99 × 774.56
4. Step 4: Simplify right side
   1,298.63x = 1,388,008.25
5. Step 5: Solve for x
   x = 1,388,008.25/1,298.63
6. Step 6: Final answer
   x = 1,068.82