Finding the Fourth Proportional to 2,172.22, 3,259.55 and 786.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,172.22 : 3,259.55 = 786.72 : x
2. Step 2: Convert to fraction form
   2,172.22/3,259.55 = 786.72/x
3. Step 3: Cross multiply
   2,172.22x = 3,259.55 × 786.72
4. Step 4: Simplify right side
   2,172.22x = 2,564,342.92
5. Step 5: Solve for x
   x = 2,564,342.92/2,172.22
6. Step 6: Final answer
   x = 1,180.52