Finding the Fourth Proportional to 3,420.83, 5,142.72 and 2,699.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,420.83 : 5,142.72 = 2,699.12 : x
2. Step 2: Convert to fraction form
   3,420.83/5,142.72 = 2,699.12/x
3. Step 3: Cross multiply
   3,420.83x = 5,142.72 × 2,699.12
4. Step 4: Simplify right side
   3,420.83x = 13,880,818.41
5. Step 5: Solve for x
   x = 13,880,818.41/3,420.83
6. Step 6: Final answer
   x = 4,057.73