Finding the Fourth Proportional to 2,103.40, 2,902.64 and 1,171.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.40 : 2,902.64 = 1,171.90 : x
2. Step 2: Convert to fraction form
   2,103.40/2,902.64 = 1,171.90/x
3. Step 3: Cross multiply
   2,103.40x = 2,902.64 × 1,171.90
4. Step 4: Simplify right side
   2,103.40x = 3,401,603.82
5. Step 5: Solve for x
   x = 3,401,603.82/2,103.40
6. Step 6: Final answer
   x = 1,617.19