Finding the Fourth Proportional to 1,128.72, 1,558.59 and 943.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.72 : 1,558.59 = 943.20 : x
2. Step 2: Convert to fraction form
   1,128.72/1,558.59 = 943.20/x
3. Step 3: Cross multiply
   1,128.72x = 1,558.59 × 943.20
4. Step 4: Simplify right side
   1,128.72x = 1,470,062.09
5. Step 5: Solve for x
   x = 1,470,062.09/1,128.72
6. Step 6: Final answer
   x = 1,302.42