Finding the Fourth Proportional to 3,819.67, 5,725.46 and 2,428.63

Step by Step Solution

1. Step 1: Write the proportion equation
   3,819.67 : 5,725.46 = 2,428.63 : x
2. Step 2: Convert to fraction form
   3,819.67/5,725.46 = 2,428.63/x
3. Step 3: Cross multiply
   3,819.67x = 5,725.46 × 2,428.63
4. Step 4: Simplify right side
   3,819.67x = 13,905,011.78
5. Step 5: Solve for x
   x = 13,905,011.78/3,819.67
6. Step 6: Final answer
   x = 3,640.37