Finding the Fourth Proportional to 1,780.12, 2,668.56 and 959.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780.12 : 2,668.56 = 959.08 : x
2. Step 2: Convert to fraction form
   1,780.12/2,668.56 = 959.08/x
3. Step 3: Cross multiply
   1,780.12x = 2,668.56 × 959.08
4. Step 4: Simplify right side
   1,780.12x = 2,559,362.52
5. Step 5: Solve for x
   x = 2,559,362.52/1,780.12
6. Step 6: Final answer
   x = 1,437.75