Finding the Fourth Proportional to 1,288.02, 1,776.54 and 889.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288.02 : 1,776.54 = 889.82 : x
2. Step 2: Convert to fraction form
   1,288.02/1,776.54 = 889.82/x
3. Step 3: Cross multiply
   1,288.02x = 1,776.54 × 889.82
4. Step 4: Simplify right side
   1,288.02x = 1,580,800.82
5. Step 5: Solve for x
   x = 1,580,800.82/1,288.02
6. Step 6: Final answer
   x = 1,227.31