Finding the Fourth Proportional to 1,605.57, 2,215.81 and 933.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,605.57 : 2,215.81 = 933.59 : x
2. Step 2: Convert to fraction form
   1,605.57/2,215.81 = 933.59/x
3. Step 3: Cross multiply
   1,605.57x = 2,215.81 × 933.59
4. Step 4: Simplify right side
   1,605.57x = 2,068,650.17
5. Step 5: Solve for x
   x = 2,068,650.17/1,605.57
6. Step 6: Final answer
   x = 1,288.42