Finding the Fourth Proportional to 1,386.14, 1,912.89 and 756.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.14 : 1,912.89 = 756.67 : x
2. Step 2: Convert to fraction form
   1,386.14/1,912.89 = 756.67/x
3. Step 3: Cross multiply
   1,386.14x = 1,912.89 × 756.67
4. Step 4: Simplify right side
   1,386.14x = 1,447,426.48
5. Step 5: Solve for x
   x = 1,447,426.48/1,386.14
6. Step 6: Final answer
   x = 1,044.21