Finding the Fourth Proportional to 2,661.91, 3,992.94 and 714.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,661.91 : 3,992.94 = 714.12 : x
2. Step 2: Convert to fraction form
   2,661.91/3,992.94 = 714.12/x
3. Step 3: Cross multiply
   2,661.91x = 3,992.94 × 714.12
4. Step 4: Simplify right side
   2,661.91x = 2,851,438.31
5. Step 5: Solve for x
   x = 2,851,438.31/2,661.91
6. Step 6: Final answer
   x = 1,071.20