Finding the Fourth Proportional to 3,938.78, 5,436.32 and 2,261.34

Step by Step Solution

1. Step 1: Write the proportion equation
   3,938.78 : 5,436.32 = 2,261.34 : x
2. Step 2: Convert to fraction form
   3,938.78/5,436.32 = 2,261.34/x
3. Step 3: Cross multiply
   3,938.78x = 5,436.32 × 2,261.34
4. Step 4: Simplify right side
   3,938.78x = 12,293,367.87
5. Step 5: Solve for x
   x = 12,293,367.87/3,938.78
6. Step 6: Final answer
   x = 3,121.11