Finding the Fourth Proportional to 1,128.86, 1,556.96 and 755.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.86 : 1,556.96 = 755.72 : x
2. Step 2: Convert to fraction form
   1,128.86/1,556.96 = 755.72/x
3. Step 3: Cross multiply
   1,128.86x = 1,556.96 × 755.72
4. Step 4: Simplify right side
   1,128.86x = 1,176,625.81
5. Step 5: Solve for x
   x = 1,176,625.81/1,128.86
6. Step 6: Final answer
   x = 1,042.31