Finding the Fourth Proportional to 2,436.78, 3,362.82 and 1,388.85

Step by Step Solution

1. Step 1: Write the proportion equation
   2,436.78 : 3,362.82 = 1,388.85 : x
2. Step 2: Convert to fraction form
   2,436.78/3,362.82 = 1,388.85/x
3. Step 3: Cross multiply
   2,436.78x = 3,362.82 × 1,388.85
4. Step 4: Simplify right side
   2,436.78x = 4,670,434.74
5. Step 5: Solve for x
   x = 4,670,434.74/2,436.78
6. Step 6: Final answer
   x = 1,916.64