Finding the Fourth Proportional to 2,081.21, 2,871.56 and 1,242.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.21 : 2,871.56 = 1,242.22 : x
2. Step 2: Convert to fraction form
   2,081.21/2,871.56 = 1,242.22/x
3. Step 3: Cross multiply
   2,081.21x = 2,871.56 × 1,242.22
4. Step 4: Simplify right side
   2,081.21x = 3,567,109.26
5. Step 5: Solve for x
   x = 3,567,109.26/2,081.21
6. Step 6: Final answer
   x = 1,713.96