Finding the Fourth Proportional to 2,436.40, 3,362.16 and 1,388.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,436.40 : 3,362.16 = 1,388.56 : x
2. Step 2: Convert to fraction form
   2,436.40/3,362.16 = 1,388.56/x
3. Step 3: Cross multiply
   2,436.40x = 3,362.16 × 1,388.56
4. Step 4: Simplify right side
   2,436.40x = 4,668,560.89
5. Step 5: Solve for x
   x = 4,668,560.89/2,436.40
6. Step 6: Final answer
   x = 1,916.17