Finding the Fourth Proportional to 1,225.89, 1,689.52 and 893.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,225.89 : 1,689.52 = 893.79 : x
2. Step 2: Convert to fraction form
   1,225.89/1,689.52 = 893.79/x
3. Step 3: Cross multiply
   1,225.89x = 1,689.52 × 893.79
4. Step 4: Simplify right side
   1,225.89x = 1,510,076.08
5. Step 5: Solve for x
   x = 1,510,076.08/1,225.89
6. Step 6: Final answer
   x = 1,231.82