Finding the Fourth Proportional to 1,385.37, 1,912.14 and 889.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.37 : 1,912.14 = 889.20 : x
2. Step 2: Convert to fraction form
   1,385.37/1,912.14 = 889.20/x
3. Step 3: Cross multiply
   1,385.37x = 1,912.14 × 889.20
4. Step 4: Simplify right side
   1,385.37x = 1,700,274.89
5. Step 5: Solve for x
   x = 1,700,274.89/1,385.37
6. Step 6: Final answer
   x = 1,227.31