Finding the Fourth Proportional to 2,178.68, 3,007.50 and 1,392.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,178.68 : 3,007.50 = 1,392.56 : x
2. Step 2: Convert to fraction form
   2,178.68/3,007.50 = 1,392.56/x
3. Step 3: Cross multiply
   2,178.68x = 3,007.50 × 1,392.56
4. Step 4: Simplify right side
   2,178.68x = 4,188,124.20
5. Step 5: Solve for x
   x = 4,188,124.20/2,178.68
6. Step 6: Final answer
   x = 1,922.32