Finding the Fourth Proportional to 1,891.89, 2,608.54 and 1,228.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,891.89 : 2,608.54 = 1,228.50 : x
2. Step 2: Convert to fraction form
   1,891.89/2,608.54 = 1,228.50/x
3. Step 3: Cross multiply
   1,891.89x = 2,608.54 × 1,228.50
4. Step 4: Simplify right side
   1,891.89x = 3,204,592.93
5. Step 5: Solve for x
   x = 3,204,592.93/1,891.89
6. Step 6: Final answer
   x = 1,693.86