Finding the Fourth Proportional to 2,382.95, 3,288.81 and 1,388.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,382.95 : 3,288.81 = 1,388.78 : x
2. Step 2: Convert to fraction form
   2,382.95/3,288.81 = 1,388.78/x
3. Step 3: Cross multiply
   2,382.95x = 3,288.81 × 1,388.78
4. Step 4: Simplify right side
   2,382.95x = 4,567,433.55
5. Step 5: Solve for x
   x = 4,567,433.55/2,382.95
6. Step 6: Final answer
   x = 1,916.71