Finding the Fourth Proportional to 3,423.47, 5,120.61 and 2,103.98

Step by Step Solution

1. Step 1: Write the proportion equation
   3,423.47 : 5,120.61 = 2,103.98 : x
2. Step 2: Convert to fraction form
   3,423.47/5,120.61 = 2,103.98/x
3. Step 3: Cross multiply
   3,423.47x = 5,120.61 × 2,103.98
4. Step 4: Simplify right side
   3,423.47x = 10,773,635.42
5. Step 5: Solve for x
   x = 10,773,635.42/3,423.47
6. Step 6: Final answer
   x = 3,147.00