Finding the Fourth Proportional to 2,172.33, 2,997.74 and 1,287.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,172.33 : 2,997.74 = 1,287.61 : x
2. Step 2: Convert to fraction form
   2,172.33/2,997.74 = 1,287.61/x
3. Step 3: Cross multiply
   2,172.33x = 2,997.74 × 1,287.61
4. Step 4: Simplify right side
   2,172.33x = 3,859,915.73
5. Step 5: Solve for x
   x = 3,859,915.73/2,172.33
6. Step 6: Final answer
   x = 1,776.86