Finding the Fourth Proportional to 2,375.56, 3,278.48 and 1,380.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,375.56 : 3,278.48 = 1,380.78 : x
2. Step 2: Convert to fraction form
   2,375.56/3,278.48 = 1,380.78/x
3. Step 3: Cross multiply
   2,375.56x = 3,278.48 × 1,380.78
4. Step 4: Simplify right side
   2,375.56x = 4,526,845.59
5. Step 5: Solve for x
   x = 4,526,845.59/2,375.56
6. Step 6: Final answer
   x = 1,905.59