Finding the Fourth Proportional to 1,639.72, 2,262.78 and 893.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,639.72 : 2,262.78 = 893.69 : x
2. Step 2: Convert to fraction form
   1,639.72/2,262.78 = 893.69/x
3. Step 3: Cross multiply
   1,639.72x = 2,262.78 × 893.69
4. Step 4: Simplify right side
   1,639.72x = 2,022,218.72
5. Step 5: Solve for x
   x = 2,022,218.72/1,639.72
6. Step 6: Final answer
   x = 1,233.27