Finding the Fourth Proportional to 3,404.18, 5,129.43 and 2,801.40

Step by Step Solution

1. Step 1: Write the proportion equation
   3,404.18 : 5,129.43 = 2,801.40 : x
2. Step 2: Convert to fraction form
   3,404.18/5,129.43 = 2,801.40/x
3. Step 3: Cross multiply
   3,404.18x = 5,129.43 × 2,801.40
4. Step 4: Simplify right side
   3,404.18x = 14,369,585.20
5. Step 5: Solve for x
   x = 14,369,585.20/3,404.18
6. Step 6: Final answer
   x = 4,221.17