Finding the Fourth Proportional to 1,279.27, 1,915.57 and 1,072.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,279.27 : 1,915.57 = 1,072.81 : x
2. Step 2: Convert to fraction form
   1,279.27/1,915.57 = 1,072.81/x
3. Step 3: Cross multiply
   1,279.27x = 1,915.57 × 1,072.81
4. Step 4: Simplify right side
   1,279.27x = 2,055,042.65
5. Step 5: Solve for x
   x = 2,055,042.65/1,279.27
6. Step 6: Final answer
   x = 1,606.42