Finding the Fourth Proportional to 1,139.05, 1,570.04 and 889.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.05 : 1,570.04 = 889.93 : x
2. Step 2: Convert to fraction form
   1,139.05/1,570.04 = 889.93/x
3. Step 3: Cross multiply
   1,139.05x = 1,570.04 × 889.93
4. Step 4: Simplify right side
   1,139.05x = 1,397,226.55
5. Step 5: Solve for x
   x = 1,397,226.55/1,139.05
6. Step 6: Final answer
   x = 1,226.66