Finding the Fourth Proportional to 1,385.05, 1,911.32 and 755.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.05 : 1,911.32 = 755.57 : x
2. Step 2: Convert to fraction form
   1,385.05/1,911.32 = 755.57/x
3. Step 3: Cross multiply
   1,385.05x = 1,911.32 × 755.57
4. Step 4: Simplify right side
   1,385.05x = 1,444,132.27
5. Step 5: Solve for x
   x = 1,444,132.27/1,385.05
6. Step 6: Final answer
   x = 1,042.66