Finding the Fourth Proportional to 1,298.30, 1,791.72 and 774.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,298.30 : 1,791.72 = 774.36 : x
2. Step 2: Convert to fraction form
   1,298.30/1,791.72 = 774.36/x
3. Step 3: Cross multiply
   1,298.30x = 1,791.72 × 774.36
4. Step 4: Simplify right side
   1,298.30x = 1,387,436.30
5. Step 5: Solve for x
   x = 1,387,436.30/1,298.30
6. Step 6: Final answer
   x = 1,068.66