Finding the Fourth Proportional to 1,064.72, 1,469.88 and 889.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,064.72 : 1,469.88 = 889.76 : x
2. Step 2: Convert to fraction form
   1,064.72/1,469.88 = 889.76/x
3. Step 3: Cross multiply
   1,064.72x = 1,469.88 × 889.76
4. Step 4: Simplify right side
   1,064.72x = 1,307,833.08
5. Step 5: Solve for x
   x = 1,307,833.08/1,064.72
6. Step 6: Final answer
   x = 1,228.34