Finding the Fourth Proportional to 2,155.69, 2,974.91 and 1,211.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.69 : 2,974.91 = 1,211.56 : x
2. Step 2: Convert to fraction form
   2,155.69/2,974.91 = 1,211.56/x
3. Step 3: Cross multiply
   2,155.69x = 2,974.91 × 1,211.56
4. Step 4: Simplify right side
   2,155.69x = 3,604,268.46
5. Step 5: Solve for x
   x = 3,604,268.46/2,155.69
6. Step 6: Final answer
   x = 1,671.98