Finding the Fourth Proportional to 2,611.78, 3,915.78 and 945.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,611.78 : 3,915.78 = 945.34 : x
2. Step 2: Convert to fraction form
   2,611.78/3,915.78 = 945.34/x
3. Step 3: Cross multiply
   2,611.78x = 3,915.78 × 945.34
4. Step 4: Simplify right side
   2,611.78x = 3,701,743.47
5. Step 5: Solve for x
   x = 3,701,743.47/2,611.78
6. Step 6: Final answer
   x = 1,417.33