Finding the Fourth Proportional to 2,172.72, 2,998.33 and 1,228.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,172.72 : 2,998.33 = 1,228.69 : x
2. Step 2: Convert to fraction form
   2,172.72/2,998.33 = 1,228.69/x
3. Step 3: Cross multiply
   2,172.72x = 2,998.33 × 1,228.69
4. Step 4: Simplify right side
   2,172.72x = 3,684,032.96
5. Step 5: Solve for x
   x = 3,684,032.96/2,172.72
6. Step 6: Final answer
   x = 1,695.59