Finding the Fourth Proportional to 1,216.54, 1,679.05 and 774.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216.54 : 1,679.05 = 774.96 : x
2. Step 2: Convert to fraction form
   1,216.54/1,679.05 = 774.96/x
3. Step 3: Cross multiply
   1,216.54x = 1,679.05 × 774.96
4. Step 4: Simplify right side
   1,216.54x = 1,301,196.59
5. Step 5: Solve for x
   x = 1,301,196.59/1,216.54
6. Step 6: Final answer
   x = 1,069.59