Finding the Fourth Proportional to 1,940.90, 2,912.70 and 1,393.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,940.90 : 2,912.70 = 1,393.55 : x
2. Step 2: Convert to fraction form
   1,940.90/2,912.70 = 1,393.55/x
3. Step 3: Cross multiply
   1,940.90x = 2,912.70 × 1,393.55
4. Step 4: Simplify right side
   1,940.90x = 4,058,978.52
5. Step 5: Solve for x
   x = 4,058,978.52/1,940.90
6. Step 6: Final answer
   x = 2,091.29