Finding the Fourth Proportional to 1,385.88, 1,912.46 and 756.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.88 : 1,912.46 = 756.39 : x
2. Step 2: Convert to fraction form
   1,385.88/1,912.46 = 756.39/x
3. Step 3: Cross multiply
   1,385.88x = 1,912.46 × 756.39
4. Step 4: Simplify right side
   1,385.88x = 1,446,569.01
5. Step 5: Solve for x
   x = 1,446,569.01/1,385.88
6. Step 6: Final answer
   x = 1,043.79