Finding the Fourth Proportional to 1,131.48, 1,561.41 and 689.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.48 : 1,561.41 = 689.22 : x
2. Step 2: Convert to fraction form
   1,131.48/1,561.41 = 689.22/x
3. Step 3: Cross multiply
   1,131.48x = 1,561.41 × 689.22
4. Step 4: Simplify right side
   1,131.48x = 1,076,155.00
5. Step 5: Solve for x
   x = 1,076,155.00/1,131.48
6. Step 6: Final answer
   x = 951.10