Finding the Fourth Proportional to 1,071.24, 1,607.27 and 659.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.24 : 1,607.27 = 659.76 : x
2. Step 2: Convert to fraction form
   1,071.24/1,607.27 = 659.76/x
3. Step 3: Cross multiply
   1,071.24x = 1,607.27 × 659.76
4. Step 4: Simplify right side
   1,071.24x = 1,060,409.16
5. Step 5: Solve for x
   x = 1,060,409.16/1,071.24
6. Step 6: Final answer
   x = 989.89