Finding the Fourth Proportional to 1,006.12, 1,507.83 and 659.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,006.12 : 1,507.83 = 659.31 : x
2. Step 2: Convert to fraction form
   1,006.12/1,507.83 = 659.31/x
3. Step 3: Cross multiply
   1,006.12x = 1,507.83 × 659.31
4. Step 4: Simplify right side
   1,006.12x = 994,127.40
5. Step 5: Solve for x
   x = 994,127.40/1,006.12
6. Step 6: Final answer
   x = 988.08