Finding the Fourth Proportional to 2,196.76, 3,031.68 and 1,239.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,196.76 : 3,031.68 = 1,239.91 : x
2. Step 2: Convert to fraction form
   2,196.76/3,031.68 = 1,239.91/x
3. Step 3: Cross multiply
   2,196.76x = 3,031.68 × 1,239.91
4. Step 4: Simplify right side
   2,196.76x = 3,759,010.35
5. Step 5: Solve for x
   x = 3,759,010.35/2,196.76
6. Step 6: Final answer
   x = 1,711.16