Finding the Fourth Proportional to 1,605.42, 2,215.53 and 942.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,605.42 : 2,215.53 = 942.30 : x
2. Step 2: Convert to fraction form
   1,605.42/2,215.53 = 942.30/x
3. Step 3: Cross multiply
   1,605.42x = 2,215.53 × 942.30
4. Step 4: Simplify right side
   1,605.42x = 2,087,693.92
5. Step 5: Solve for x
   x = 2,087,693.92/1,605.42
6. Step 6: Final answer
   x = 1,300.40