Finding the Fourth Proportional to 980.69, 1,355.06 and 772.52

Step by Step Solution

1. Step 1: Write the proportion equation
   980.69 : 1,355.06 = 772.52 : x
2. Step 2: Convert to fraction form
   980.69/1,355.06 = 772.52/x
3. Step 3: Cross multiply
   980.69x = 1,355.06 × 772.52
4. Step 4: Simplify right side
   980.69x = 1,046,800.31
5. Step 5: Solve for x
   x = 1,046,800.31/980.69
6. Step 6: Final answer
   x = 1,067.42