Finding the Fourth Proportional to 1,917.98, 2,646.90 and 1,171.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,917.98 : 2,646.90 = 1,171.71 : x
2. Step 2: Convert to fraction form
   1,917.98/2,646.90 = 1,171.71/x
3. Step 3: Cross multiply
   1,917.98x = 2,646.90 × 1,171.71
4. Step 4: Simplify right side
   1,917.98x = 3,101,399.20
5. Step 5: Solve for x
   x = 3,101,399.20/1,917.98
6. Step 6: Final answer
   x = 1,617.02