Finding the Fourth Proportional to 1,071.98, 1,605.54 and 681.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.98 : 1,605.54 = 681.98 : x
2. Step 2: Convert to fraction form
   1,071.98/1,605.54 = 681.98/x
3. Step 3: Cross multiply
   1,071.98x = 1,605.54 × 681.98
4. Step 4: Simplify right side
   1,071.98x = 1,094,946.17
5. Step 5: Solve for x
   x = 1,094,946.17/1,071.98
6. Step 6: Final answer
   x = 1,021.42