Finding the Fourth Proportional to 1,017.32, 1,525.92 and 666.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.32 : 1,525.92 = 666.72 : x
2. Step 2: Convert to fraction form
   1,017.32/1,525.92 = 666.72/x
3. Step 3: Cross multiply
   1,017.32x = 1,525.92 × 666.72
4. Step 4: Simplify right side
   1,017.32x = 1,017,361.38
5. Step 5: Solve for x
   x = 1,017,361.38/1,017.32
6. Step 6: Final answer
   x = 1,000.05