Finding the Fourth Proportional to 1,386.01, 1,912.73 and 756.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.01 : 1,912.73 = 756.55 : x
2. Step 2: Convert to fraction form
   1,386.01/1,912.73 = 756.55/x
3. Step 3: Cross multiply
   1,386.01x = 1,912.73 × 756.55
4. Step 4: Simplify right side
   1,386.01x = 1,447,080.16
5. Step 5: Solve for x
   x = 1,447,080.16/1,386.01
6. Step 6: Final answer
   x = 1,044.06