Finding the Fourth Proportional to 2,627.78, 3,940.98 and 1,240.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,627.78 : 3,940.98 = 1,240.76 : x
2. Step 2: Convert to fraction form
   2,627.78/3,940.98 = 1,240.76/x
3. Step 3: Cross multiply
   2,627.78x = 3,940.98 × 1,240.76
4. Step 4: Simplify right side
   2,627.78x = 4,889,810.34
5. Step 5: Solve for x
   x = 4,889,810.34/2,627.78
6. Step 6: Final answer
   x = 1,860.81