Finding the Fourth Proportional to 2,101.77, 3,151.04 and 1,279.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,101.77 : 3,151.04 = 1,279.89 : x
2. Step 2: Convert to fraction form
   2,101.77/3,151.04 = 1,279.89/x
3. Step 3: Cross multiply
   2,101.77x = 3,151.04 × 1,279.89
4. Step 4: Simplify right side
   2,101.77x = 4,032,978.19
5. Step 5: Solve for x
   x = 4,032,978.19/2,101.77
6. Step 6: Final answer
   x = 1,918.85