Finding the Fourth Proportional to 1,559.78, 2,339.01 and 693.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,559.78 : 2,339.01 = 693.50 : x
2. Step 2: Convert to fraction form
   1,559.78/2,339.01 = 693.50/x
3. Step 3: Cross multiply
   1,559.78x = 2,339.01 × 693.50
4. Step 4: Simplify right side
   1,559.78x = 1,622,103.44
5. Step 5: Solve for x
   x = 1,622,103.44/1,559.78
6. Step 6: Final answer
   x = 1,039.96