Finding the Fourth Proportional to 2,490.28, 3,436.78 and 1,428.14

Step by Step Solution

1. Step 1: Write the proportion equation
   2,490.28 : 3,436.78 = 1,428.14 : x
2. Step 2: Convert to fraction form
   2,490.28/3,436.78 = 1,428.14/x
3. Step 3: Cross multiply
   2,490.28x = 3,436.78 × 1,428.14
4. Step 4: Simplify right side
   2,490.28x = 4,908,190.83
5. Step 5: Solve for x
   x = 4,908,190.83/2,490.28
6. Step 6: Final answer
   x = 1,970.94