Finding the Fourth Proportional to 1,131.36, 1,561.58 and 689.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.36 : 1,561.58 = 689.48 : x
2. Step 2: Convert to fraction form
   1,131.36/1,561.58 = 689.48/x
3. Step 3: Cross multiply
   1,131.36x = 1,561.58 × 689.48
4. Step 4: Simplify right side
   1,131.36x = 1,076,678.18
5. Step 5: Solve for x
   x = 1,076,678.18/1,131.36
6. Step 6: Final answer
   x = 951.67