Finding the Fourth Proportional to 1,969.10, 2,718.72 and 1,380.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,969.10 : 2,718.72 = 1,380.42 : x
2. Step 2: Convert to fraction form
   1,969.10/2,718.72 = 1,380.42/x
3. Step 3: Cross multiply
   1,969.10x = 2,718.72 × 1,380.42
4. Step 4: Simplify right side
   1,969.10x = 3,752,975.46
5. Step 5: Solve for x
   x = 3,752,975.46/1,969.10
6. Step 6: Final answer
   x = 1,905.93