Finding the Fourth Proportional to 2,132.78, 3,197.25 and 815.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,132.78 : 3,197.25 = 815.63 : x
2. Step 2: Convert to fraction form
   2,132.78/3,197.25 = 815.63/x
3. Step 3: Cross multiply
   2,132.78x = 3,197.25 × 815.63
4. Step 4: Simplify right side
   2,132.78x = 2,607,762.15
5. Step 5: Solve for x
   x = 2,607,762.15/2,132.78
6. Step 6: Final answer
   x = 1,222.71