Finding the Fourth Proportional to 1,378.53, 1,902.41 and 1,080.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,378.53 : 1,902.41 = 1,080.15 : x
2. Step 2: Convert to fraction form
   1,378.53/1,902.41 = 1,080.15/x
3. Step 3: Cross multiply
   1,378.53x = 1,902.41 × 1,080.15
4. Step 4: Simplify right side
   1,378.53x = 2,054,882.76
5. Step 5: Solve for x
   x = 2,054,882.76/1,378.53
6. Step 6: Final answer
   x = 1,490.63