Finding the Fourth Proportional to 1,139.60, 1,707.43 and 889.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.60 : 1,707.43 = 889.94 : x
2. Step 2: Convert to fraction form
   1,139.60/1,707.43 = 889.94/x
3. Step 3: Cross multiply
   1,139.60x = 1,707.43 × 889.94
4. Step 4: Simplify right side
   1,139.60x = 1,519,501.72
5. Step 5: Solve for x
   x = 1,519,501.72/1,139.60
6. Step 6: Final answer
   x = 1,333.37