Finding the Fourth Proportional to 1,386.72, 2,080.33 and 693.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.72 : 2,080.33 = 693.25 : x
2. Step 2: Convert to fraction form
   1,386.72/2,080.33 = 693.25/x
3. Step 3: Cross multiply
   1,386.72x = 2,080.33 × 693.25
4. Step 4: Simplify right side
   1,386.72x = 1,442,181.84
5. Step 5: Solve for x
   x = 1,442,181.84/1,386.72
6. Step 6: Final answer
   x = 1,039.99