Finding the Fourth Proportional to 1,017.10, 1,524.50 and 666.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.10 : 1,524.50 = 666.38 : x
2. Step 2: Convert to fraction form
   1,017.10/1,524.50 = 666.38/x
3. Step 3: Cross multiply
   1,017.10x = 1,524.50 × 666.38
4. Step 4: Simplify right side
   1,017.10x = 1,015,885.36
5. Step 5: Solve for x
   x = 1,015,885.36/1,017.10
6. Step 6: Final answer
   x = 998.81