Finding the Fourth Proportional to 1,393.88, 1,923.01 and 889.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.88 : 1,923.01 = 889.92 : x
2. Step 2: Convert to fraction form
   1,393.88/1,923.01 = 889.92/x
3. Step 3: Cross multiply
   1,393.88x = 1,923.01 × 889.92
4. Step 4: Simplify right side
   1,393.88x = 1,711,322.83
5. Step 5: Solve for x
   x = 1,711,322.83/1,393.88
6. Step 6: Final answer
   x = 1,227.74