Finding the Fourth Proportional to 2,101.16, 3,151.56 and 1,279.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,101.16 : 3,151.56 = 1,279.22 : x
2. Step 2: Convert to fraction form
   2,101.16/3,151.56 = 1,279.22/x
3. Step 3: Cross multiply
   2,101.16x = 3,151.56 × 1,279.22
4. Step 4: Simplify right side
   2,101.16x = 4,031,538.58
5. Step 5: Solve for x
   x = 4,031,538.58/2,101.16
6. Step 6: Final answer
   x = 1,918.72