Finding the Fourth Proportional to 1,546.78, 2,135.55 and 1,380.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,546.78 : 2,135.55 = 1,380.72 : x
2. Step 2: Convert to fraction form
   1,546.78/2,135.55 = 1,380.72/x
3. Step 3: Cross multiply
   1,546.78x = 2,135.55 × 1,380.72
4. Step 4: Simplify right side
   1,546.78x = 2,948,596.60
5. Step 5: Solve for x
   x = 2,948,596.60/1,546.78
6. Step 6: Final answer
   x = 1,906.28