Finding the Fourth Proportional to 2,165.61, 3,245.69 and 931.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,165.61 : 3,245.69 = 931.59 : x
2. Step 2: Convert to fraction form
   2,165.61/3,245.69 = 931.59/x
3. Step 3: Cross multiply
   2,165.61x = 3,245.69 × 931.59
4. Step 4: Simplify right side
   2,165.61x = 3,023,647.69
5. Step 5: Solve for x
   x = 3,023,647.69/2,165.61
6. Step 6: Final answer
   x = 1,396.21