Finding the Fourth Proportional to 3,219.89, 4,460.72 and 3,143.34

Step by Step Solution

1. Step 1: Write the proportion equation
   3,219.89 : 4,460.72 = 3,143.34 : x
2. Step 2: Convert to fraction form
   3,219.89/4,460.72 = 3,143.34/x
3. Step 3: Cross multiply
   3,219.89x = 4,460.72 × 3,143.34
4. Step 4: Simplify right side
   3,219.89x = 14,021,543.89
5. Step 5: Solve for x
   x = 14,021,543.89/3,219.89
6. Step 6: Final answer
   x = 4,354.67