Finding the Fourth Proportional to 2,103.10, 2,902.04 and 1,218.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.10 : 2,902.04 = 1,218.72 : x
2. Step 2: Convert to fraction form
   2,103.10/2,902.04 = 1,218.72/x
3. Step 3: Cross multiply
   2,103.10x = 2,902.04 × 1,218.72
4. Step 4: Simplify right side
   2,103.10x = 3,536,774.19
5. Step 5: Solve for x
   x = 3,536,774.19/2,103.10
6. Step 6: Final answer
   x = 1,681.70