Finding the Fourth Proportional to 2,103.59, 2,902.95 and 1,172.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.59 : 2,902.95 = 1,172.09 : x
2. Step 2: Convert to fraction form
   2,103.59/2,902.95 = 1,172.09/x
3. Step 3: Cross multiply
   2,103.59x = 2,902.95 × 1,172.09
4. Step 4: Simplify right side
   2,103.59x = 3,402,504.15
5. Step 5: Solve for x
   x = 3,402,504.15/2,103.59
6. Step 6: Final answer
   x = 1,617.48