Finding the Fourth Proportional to 3,404.30, 5,103.35 and 1,212.51

Step by Step Solution

1. Step 1: Write the proportion equation
   3,404.30 : 5,103.35 = 1,212.51 : x
2. Step 2: Convert to fraction form
   3,404.30/5,103.35 = 1,212.51/x
3. Step 3: Cross multiply
   3,404.30x = 5,103.35 × 1,212.51
4. Step 4: Simplify right side
   3,404.30x = 6,187,856.85
5. Step 5: Solve for x
   x = 6,187,856.85/3,404.30
6. Step 6: Final answer
   x = 1,817.66