Finding the Fourth Proportional to 1,385.31, 1,911.76 and 755.85

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.31 : 1,911.76 = 755.85 : x
2. Step 2: Convert to fraction form
   1,385.31/1,911.76 = 755.85/x
3. Step 3: Cross multiply
   1,385.31x = 1,911.76 × 755.85
4. Step 4: Simplify right side
   1,385.31x = 1,445,001.91
5. Step 5: Solve for x
   x = 1,445,001.91/1,385.31
6. Step 6: Final answer
   x = 1,043.09