Finding the Fourth Proportional to 1,225.71, 1,686.54 and 1,196.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,225.71 : 1,686.54 = 1,196.55 : x
2. Step 2: Convert to fraction form
   1,225.71/1,686.54 = 1,196.55/x
3. Step 3: Cross multiply
   1,225.71x = 1,686.54 × 1,196.55
4. Step 4: Simplify right side
   1,225.71x = 2,018,029.44
5. Step 5: Solve for x
   x = 2,018,029.44/1,225.71
6. Step 6: Final answer
   x = 1,646.42