Finding the Fourth Proportional to 2,040.18, 2,815.16 and 1,200.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,040.18 : 2,815.16 = 1,200.39 : x
2. Step 2: Convert to fraction form
   2,040.18/2,815.16 = 1,200.39/x
3. Step 3: Cross multiply
   2,040.18x = 2,815.16 × 1,200.39
4. Step 4: Simplify right side
   2,040.18x = 3,379,283.91
5. Step 5: Solve for x
   x = 3,379,283.91/2,040.18
6. Step 6: Final answer
   x = 1,656.37