Finding the Fourth Proportional to 3,086.78, 4,257.70 and 1,906.34

Step by Step Solution

1. Step 1: Write the proportion equation
   3,086.78 : 4,257.70 = 1,906.34 : x
2. Step 2: Convert to fraction form
   3,086.78/4,257.70 = 1,906.34/x
3. Step 3: Cross multiply
   3,086.78x = 4,257.70 × 1,906.34
4. Step 4: Simplify right side
   3,086.78x = 8,116,597.76
5. Step 5: Solve for x
   x = 8,116,597.76/3,086.78
6. Step 6: Final answer
   x = 2,629.48