Finding the Fourth Proportional to 1,605.78, 2,216.04 and 942.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,605.78 : 2,216.04 = 942.60 : x
2. Step 2: Convert to fraction form
   1,605.78/2,216.04 = 942.60/x
3. Step 3: Cross multiply
   1,605.78x = 2,216.04 × 942.60
4. Step 4: Simplify right side
   1,605.78x = 2,088,839.30
5. Step 5: Solve for x
   x = 2,088,839.30/1,605.78
6. Step 6: Final answer
   x = 1,300.83