Finding the Fourth Proportional to 2,031.72, 2,804.21 and 1,286.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,031.72 : 2,804.21 = 1,286.67 : x
2. Step 2: Convert to fraction form
   2,031.72/2,804.21 = 1,286.67/x
3. Step 3: Cross multiply
   2,031.72x = 2,804.21 × 1,286.67
4. Step 4: Simplify right side
   2,031.72x = 3,608,092.88
5. Step 5: Solve for x
   x = 3,608,092.88/2,031.72
6. Step 6: Final answer
   x = 1,775.88