Finding the Fourth Proportional to 2,071.98, 3,105.81 and 838.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.98 : 3,105.81 = 838.89 : x
2. Step 2: Convert to fraction form
   2,071.98/3,105.81 = 838.89/x
3. Step 3: Cross multiply
   2,071.98x = 3,105.81 × 838.89
4. Step 4: Simplify right side
   2,071.98x = 2,605,432.95
5. Step 5: Solve for x
   x = 2,605,432.95/2,071.98
6. Step 6: Final answer
   x = 1,257.46