Finding the Fourth Proportional to 2,168.15, 3,245.54 and 1,385.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,168.15 : 3,245.54 = 1,385.55 : x
2. Step 2: Convert to fraction form
   2,168.15/3,245.54 = 1,385.55/x
3. Step 3: Cross multiply
   2,168.15x = 3,245.54 × 1,385.55
4. Step 4: Simplify right side
   2,168.15x = 4,496,851.02
5. Step 5: Solve for x
   x = 4,496,851.02/2,168.15
6. Step 6: Final answer
   x = 2,074.05