Finding the Fourth Proportional to 2,100.78, 2,901.60 and 1,540.44

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.78 : 2,901.60 = 1,540.44 : x
2. Step 2: Convert to fraction form
   2,100.78/2,901.60 = 1,540.44/x
3. Step 3: Cross multiply
   2,100.78x = 2,901.60 × 1,540.44
4. Step 4: Simplify right side
   2,100.78x = 4,469,740.70
5. Step 5: Solve for x
   x = 4,469,740.70/2,100.78
6. Step 6: Final answer
   x = 2,127.66