Finding the Fourth Proportional to 1,386.88, 2,080.96 and 693.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.88 : 2,080.96 = 693.52 : x
2. Step 2: Convert to fraction form
   1,386.88/2,080.96 = 693.52/x
3. Step 3: Cross multiply
   1,386.88x = 2,080.96 × 693.52
4. Step 4: Simplify right side
   1,386.88x = 1,443,187.38
5. Step 5: Solve for x
   x = 1,443,187.38/1,386.88
6. Step 6: Final answer
   x = 1,040.60