Finding the Fourth Proportional to 1,385.45, 1,911.86 and 755.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.45 : 1,911.86 = 755.96 : x
2. Step 2: Convert to fraction form
   1,385.45/1,911.86 = 755.96/x
3. Step 3: Cross multiply
   1,385.45x = 1,911.86 × 755.96
4. Step 4: Simplify right side
   1,385.45x = 1,445,290.69
5. Step 5: Solve for x
   x = 1,445,290.69/1,385.45
6. Step 6: Final answer
   x = 1,043.20