Finding the Fourth Proportional to 2,172.72, 2,997.24 and 1,288.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,172.72 : 2,997.24 = 1,288.16 : x
2. Step 2: Convert to fraction form
   2,172.72/2,997.24 = 1,288.16/x
3. Step 3: Cross multiply
   2,172.72x = 2,997.24 × 1,288.16
4. Step 4: Simplify right side
   2,172.72x = 3,860,924.68
5. Step 5: Solve for x
   x = 3,860,924.68/2,172.72
6. Step 6: Final answer
   x = 1,777.00