Finding the Fourth Proportional to 1,940.22, 2,678.72 and 1,278.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,940.22 : 2,678.72 = 1,278.20 : x
2. Step 2: Convert to fraction form
   1,940.22/2,678.72 = 1,278.20/x
3. Step 3: Cross multiply
   1,940.22x = 2,678.72 × 1,278.20
4. Step 4: Simplify right side
   1,940.22x = 3,423,932.33
5. Step 5: Solve for x
   x = 3,423,932.33/1,940.22
6. Step 6: Final answer
   x = 1,764.71