Finding the Fourth Proportional to 1,917.11, 2,645.41 and 1,171.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,917.11 : 2,645.41 = 1,171.25 : x
2. Step 2: Convert to fraction form
   1,917.11/2,645.41 = 1,171.25/x
3. Step 3: Cross multiply
   1,917.11x = 2,645.41 × 1,171.25
4. Step 4: Simplify right side
   1,917.11x = 3,098,420.31
5. Step 5: Solve for x
   x = 3,098,420.31/1,917.11
6. Step 6: Final answer
   x = 1,616.20