Finding the Fourth Proportional to 2,172.84, 2,998.50 and 1,288.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,172.84 : 2,998.50 = 1,288.52 : x
2. Step 2: Convert to fraction form
   2,172.84/2,998.50 = 1,288.52/x
3. Step 3: Cross multiply
   2,172.84x = 2,998.50 × 1,288.52
4. Step 4: Simplify right side
   2,172.84x = 3,863,627.22
5. Step 5: Solve for x
   x = 3,863,627.22/2,172.84
6. Step 6: Final answer
   x = 1,778.15