Finding the Fourth Proportional to 2,102.81, 2,901.88 and 1,171.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,102.81 : 2,901.88 = 1,171.31 : x
2. Step 2: Convert to fraction form
   2,102.81/2,901.88 = 1,171.31/x
3. Step 3: Cross multiply
   2,102.81x = 2,901.88 × 1,171.31
4. Step 4: Simplify right side
   2,102.81x = 3,399,009.78
5. Step 5: Solve for x
   x = 3,399,009.78/2,102.81
6. Step 6: Final answer
   x = 1,616.41