Finding the Fourth Proportional to 2,031.96, 3,045.50 and 861.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,031.96 : 3,045.50 = 861.72 : x
2. Step 2: Convert to fraction form
   2,031.96/3,045.50 = 861.72/x
3. Step 3: Cross multiply
   2,031.96x = 3,045.50 × 861.72
4. Step 4: Simplify right side
   2,031.96x = 2,624,348.72
5. Step 5: Solve for x
   x = 2,624,348.72/2,031.96
6. Step 6: Final answer
   x = 1,291.54