Finding the Fourth Proportional to 1,380.80, 2,061.04 and 1,294.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.80 : 2,061.04 = 1,294.40 : x
2. Step 2: Convert to fraction form
   1,380.80/2,061.04 = 1,294.40/x
3. Step 3: Cross multiply
   1,380.80x = 2,061.04 × 1,294.40
4. Step 4: Simplify right side
   1,380.80x = 2,667,810.18
5. Step 5: Solve for x
   x = 2,667,810.18/1,380.80
6. Step 6: Final answer
   x = 1,932.08