Finding the Fourth Proportional to 1,969.72, 2,715.78 and 1,380.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,969.72 : 2,715.78 = 1,380.04 : x
2. Step 2: Convert to fraction form
   1,969.72/2,715.78 = 1,380.04/x
3. Step 3: Cross multiply
   1,969.72x = 2,715.78 × 1,380.04
4. Step 4: Simplify right side
   1,969.72x = 3,747,885.03
5. Step 5: Solve for x
   x = 3,747,885.03/1,969.72
6. Step 6: Final answer
   x = 1,902.75