Finding the Fourth Proportional to 1,131.56, 1,560.06 and 816.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.56 : 1,560.06 = 816.56 : x
2. Step 2: Convert to fraction form
   1,131.56/1,560.06 = 816.56/x
3. Step 3: Cross multiply
   1,131.56x = 1,560.06 × 816.56
4. Step 4: Simplify right side
   1,131.56x = 1,273,882.59
5. Step 5: Solve for x
   x = 1,273,882.59/1,131.56
6. Step 6: Final answer
   x = 1,125.78