Finding the Fourth Proportional to 2,390.56, 3,278.89 and 2,277.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,390.56 : 3,278.89 = 2,277.16 : x
2. Step 2: Convert to fraction form
   2,390.56/3,278.89 = 2,277.16/x
3. Step 3: Cross multiply
   2,390.56x = 3,278.89 × 2,277.16
4. Step 4: Simplify right side
   2,390.56x = 7,466,557.15
5. Step 5: Solve for x
   x = 7,466,557.15/2,390.56
6. Step 6: Final answer
   x = 3,123.35