Finding the Fourth Proportional to 2,428.71, 3,351.56 and 1,380.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,428.71 : 3,351.56 = 1,380.75 : x
2. Step 2: Convert to fraction form
   2,428.71/3,351.56 = 1,380.75/x
3. Step 3: Cross multiply
   2,428.71x = 3,351.56 × 1,380.75
4. Step 4: Simplify right side
   2,428.71x = 4,627,659.57
5. Step 5: Solve for x
   x = 4,627,659.57/2,428.71
6. Step 6: Final answer
   x = 1,905.40