Finding the Fourth Proportional to 2,155.51, 2,974.92 and 1,316.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.51 : 2,974.92 = 1,316.69 : x
2. Step 2: Convert to fraction form
   2,155.51/2,974.92 = 1,316.69/x
3. Step 3: Cross multiply
   2,155.51x = 2,974.92 × 1,316.69
4. Step 4: Simplify right side
   2,155.51x = 3,917,062.90
5. Step 5: Solve for x
   x = 3,917,062.90/2,155.51
6. Step 6: Final answer
   x = 1,817.23