Finding the Fourth Proportional to 1,559.30, 2,151.95 and 969.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,559.30 : 2,151.95 = 969.81 : x
2. Step 2: Convert to fraction form
   1,559.30/2,151.95 = 969.81/x
3. Step 3: Cross multiply
   1,559.30x = 2,151.95 × 969.81
4. Step 4: Simplify right side
   1,559.30x = 2,086,977.78
5. Step 5: Solve for x
   x = 2,086,977.78/1,559.30
6. Step 6: Final answer
   x = 1,338.41