Finding the Fourth Proportional to 1,208.82, 1,668.88 and 928.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,208.82 : 1,668.88 = 928.50 : x
2. Step 2: Convert to fraction form
   1,208.82/1,668.88 = 928.50/x
3. Step 3: Cross multiply
   1,208.82x = 1,668.88 × 928.50
4. Step 4: Simplify right side
   1,208.82x = 1,549,559.02
5. Step 5: Solve for x
   x = 1,549,559.02/1,208.82
6. Step 6: Final answer
   x = 1,281.88