Finding the Fourth Proportional to 1,901.33, 2,620.83 and 1,428.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,901.33 : 2,620.83 = 1,428.54 : x
2. Step 2: Convert to fraction form
   1,901.33/2,620.83 = 1,428.54/x
3. Step 3: Cross multiply
   1,901.33x = 2,620.83 × 1,428.54
4. Step 4: Simplify right side
   1,901.33x = 3,743,960.49
5. Step 5: Solve for x
   x = 3,743,960.49/1,901.33
6. Step 6: Final answer
   x = 1,969.13