Finding the Fourth Proportional to 2,172.03, 2,996.82 and 1,287.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,172.03 : 2,996.82 = 1,287.51 : x
2. Step 2: Convert to fraction form
   2,172.03/2,996.82 = 1,287.51/x
3. Step 3: Cross multiply
   2,172.03x = 2,996.82 × 1,287.51
4. Step 4: Simplify right side
   2,172.03x = 3,858,435.72
5. Step 5: Solve for x
   x = 3,858,435.72/2,172.03
6. Step 6: Final answer
   x = 1,776.42