Finding the Fourth Proportional to 2,155.15, 2,974.03 and 1,317.26

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.15 : 2,974.03 = 1,317.26 : x
2. Step 2: Convert to fraction form
   2,155.15/2,974.03 = 1,317.26/x
3. Step 3: Cross multiply
   2,155.15x = 2,974.03 × 1,317.26
4. Step 4: Simplify right side
   2,155.15x = 3,917,570.76
5. Step 5: Solve for x
   x = 3,917,570.76/2,155.15
6. Step 6: Final answer
   x = 1,817.77