Finding the Fourth Proportional to 2,978.57, 4,112.15 and 1,800.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.57 : 4,112.15 = 1,800.02 : x
2. Step 2: Convert to fraction form
   2,978.57/4,112.15 = 1,800.02/x
3. Step 3: Cross multiply
   2,978.57x = 4,112.15 × 1,800.02
4. Step 4: Simplify right side
   2,978.57x = 7,401,922.68
5. Step 5: Solve for x
   x = 7,401,922.68/2,978.57
6. Step 6: Final answer
   x = 2,485.06