Finding the Fourth Proportional to 980.55, 1,469.31 and 774.61

Step by Step Solution

1. Step 1: Write the proportion equation
   980.55 : 1,469.31 = 774.61 : x
2. Step 2: Convert to fraction form
   980.55/1,469.31 = 774.61/x
3. Step 3: Cross multiply
   980.55x = 1,469.31 × 774.61
4. Step 4: Simplify right side
   980.55x = 1,138,142.22
5. Step 5: Solve for x
   x = 1,138,142.22/980.55
6. Step 6: Final answer
   x = 1,160.72