Finding the Fourth Proportional to 1,385.94, 1,912.57 and 756.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.94 : 1,912.57 = 756.47 : x
2. Step 2: Convert to fraction form
   1,385.94/1,912.57 = 756.47/x
3. Step 3: Cross multiply
   1,385.94x = 1,912.57 × 756.47
4. Step 4: Simplify right side
   1,385.94x = 1,446,801.83
5. Step 5: Solve for x
   x = 1,446,801.83/1,385.94
6. Step 6: Final answer
   x = 1,043.91