Finding the Fourth Proportional to 1,131.56, 1,562.28 and 712.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.56 : 1,562.28 = 712.48 : x
2. Step 2: Convert to fraction form
   1,131.56/1,562.28 = 712.48/x
3. Step 3: Cross multiply
   1,131.56x = 1,562.28 × 712.48
4. Step 4: Simplify right side
   1,131.56x = 1,113,093.25
5. Step 5: Solve for x
   x = 1,113,093.25/1,131.56
6. Step 6: Final answer
   x = 983.68