Finding the Fourth Proportional to 2,740.78, 4,111.36 and 892.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,740.78 : 4,111.36 = 892.50 : x
2. Step 2: Convert to fraction form
   2,740.78/4,111.36 = 892.50/x
3. Step 3: Cross multiply
   2,740.78x = 4,111.36 × 892.50
4. Step 4: Simplify right side
   2,740.78x = 3,669,388.80
5. Step 5: Solve for x
   x = 3,669,388.80/2,740.78
6. Step 6: Final answer
   x = 1,338.81