Finding the Fourth Proportional to 1,576.61, 2,175.72 and 868.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,576.61 : 2,175.72 = 868.49 : x
2. Step 2: Convert to fraction form
   1,576.61/2,175.72 = 868.49/x
3. Step 3: Cross multiply
   1,576.61x = 2,175.72 × 868.49
4. Step 4: Simplify right side
   1,576.61x = 1,889,591.06
5. Step 5: Solve for x
   x = 1,889,591.06/1,576.61
6. Step 6: Final answer
   x = 1,198.52