Finding the Fourth Proportional to 1,320.69, 1,980.42 and 773.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320.69 : 1,980.42 = 773.04 : x
2. Step 2: Convert to fraction form
   1,320.69/1,980.42 = 773.04/x
3. Step 3: Cross multiply
   1,320.69x = 1,980.42 × 773.04
4. Step 4: Simplify right side
   1,320.69x = 1,530,943.88
5. Step 5: Solve for x
   x = 1,530,943.88/1,320.69
6. Step 6: Final answer
   x = 1,159.20