Finding the Fourth Proportional to 1,385.35, 1,911.78 and 755.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.35 : 1,911.78 = 755.88 : x
2. Step 2: Convert to fraction form
   1,385.35/1,911.78 = 755.88/x
3. Step 3: Cross multiply
   1,385.35x = 1,911.78 × 755.88
4. Step 4: Simplify right side
   1,385.35x = 1,445,069.10
5. Step 5: Solve for x
   x = 1,445,069.10/1,385.35
6. Step 6: Final answer
   x = 1,043.11