Finding the Fourth Proportional to 1,131.90, 1,562.09 and 712.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.90 : 1,562.09 = 712.10 : x
2. Step 2: Convert to fraction form
   1,131.90/1,562.09 = 712.10/x
3. Step 3: Cross multiply
   1,131.90x = 1,562.09 × 712.10
4. Step 4: Simplify right side
   1,131.90x = 1,112,352.92
5. Step 5: Solve for x
   x = 1,112,352.92/1,131.90
6. Step 6: Final answer
   x = 982.73