Finding the Fourth Proportional to 1,902.69, 2,624.76 and 1,640.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,902.69 : 2,624.76 = 1,640.25 : x
2. Step 2: Convert to fraction form
   1,902.69/2,624.76 = 1,640.25/x
3. Step 3: Cross multiply
   1,902.69x = 2,624.76 × 1,640.25
4. Step 4: Simplify right side
   1,902.69x = 4,305,262.59
5. Step 5: Solve for x
   x = 4,305,262.59/1,902.69
6. Step 6: Final answer
   x = 2,262.72