Finding the Fourth Proportional to 2,661.22, 3,992.82 and 1,275.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,661.22 : 3,992.82 = 1,275.16 : x
2. Step 2: Convert to fraction form
   2,661.22/3,992.82 = 1,275.16/x
3. Step 3: Cross multiply
   2,661.22x = 3,992.82 × 1,275.16
4. Step 4: Simplify right side
   2,661.22x = 5,091,484.35
5. Step 5: Solve for x
   x = 5,091,484.35/2,661.22
6. Step 6: Final answer
   x = 1,913.21