Finding the Fourth Proportional to 1,615.94, 2,421.59 and 691.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,615.94 : 2,421.59 = 691.25 : x
2. Step 2: Convert to fraction form
   1,615.94/2,421.59 = 691.25/x
3. Step 3: Cross multiply
   1,615.94x = 2,421.59 × 691.25
4. Step 4: Simplify right side
   1,615.94x = 1,673,908.52
5. Step 5: Solve for x
   x = 1,673,908.52/1,615.94
6. Step 6: Final answer
   x = 1,035.87