Finding the Fourth Proportional to 1,940.67, 2,660.67 and 1,905.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,940.67 : 2,660.67 = 1,905.57 : x
2. Step 2: Convert to fraction form
   1,940.67/2,660.67 = 1,905.57/x
3. Step 3: Cross multiply
   1,940.67x = 2,660.67 × 1,905.57
4. Step 4: Simplify right side
   1,940.67x = 5,070,092.93
5. Step 5: Solve for x
   x = 5,070,092.93/1,940.67
6. Step 6: Final answer
   x = 2,612.55