Finding the Fourth Proportional to 1,371.07, 1,890.82 and 1,172.65

Step by Step Solution

1. Step 1: Write the proportion equation
   1,371.07 : 1,890.82 = 1,172.65 : x
2. Step 2: Convert to fraction form
   1,371.07/1,890.82 = 1,172.65/x
3. Step 3: Cross multiply
   1,371.07x = 1,890.82 × 1,172.65
4. Step 4: Simplify right side
   1,371.07x = 2,217,257.69
5. Step 5: Solve for x
   x = 2,217,257.69/1,371.07
6. Step 6: Final answer
   x = 1,617.18