Finding the Fourth Proportional to 1,605.90, 2,215.71 and 942.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,605.90 : 2,215.71 = 942.60 : x
2. Step 2: Convert to fraction form
   1,605.90/2,215.71 = 942.60/x
3. Step 3: Cross multiply
   1,605.90x = 2,215.71 × 942.60
4. Step 4: Simplify right side
   1,605.90x = 2,088,528.25
5. Step 5: Solve for x
   x = 2,088,528.25/1,605.90
6. Step 6: Final answer
   x = 1,300.53