Finding the Fourth Proportional to 1,279.72, 1,766.82 and 886.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,279.72 : 1,766.82 = 886.60 : x
2. Step 2: Convert to fraction form
   1,279.72/1,766.82 = 886.60/x
3. Step 3: Cross multiply
   1,279.72x = 1,766.82 × 886.60
4. Step 4: Simplify right side
   1,279.72x = 1,566,462.61
5. Step 5: Solve for x
   x = 1,566,462.61/1,279.72
6. Step 6: Final answer
   x = 1,224.07