Finding the Fourth Proportional to 2,072.56, 3,108.60 and 840.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,072.56 : 3,108.60 = 840.52 : x
2. Step 2: Convert to fraction form
   2,072.56/3,108.60 = 840.52/x
3. Step 3: Cross multiply
   2,072.56x = 3,108.60 × 840.52
4. Step 4: Simplify right side
   2,072.56x = 2,612,840.47
5. Step 5: Solve for x
   x = 2,612,840.47/2,072.56
6. Step 6: Final answer
   x = 1,260.68