Finding the Fourth Proportional to 1,131.80, 1,562.06 and 659.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.80 : 1,562.06 = 659.71 : x
2. Step 2: Convert to fraction form
   1,131.80/1,562.06 = 659.71/x
3. Step 3: Cross multiply
   1,131.80x = 1,562.06 × 659.71
4. Step 4: Simplify right side
   1,131.80x = 1,030,506.60
5. Step 5: Solve for x
   x = 1,030,506.60/1,131.80
6. Step 6: Final answer
   x = 910.50