Finding the Fourth Proportional to 1,131.17, 1,561.19 and 689.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.17 : 1,561.19 = 689.01 : x
2. Step 2: Convert to fraction form
   1,131.17/1,561.19 = 689.01/x
3. Step 3: Cross multiply
   1,131.17x = 1,561.19 × 689.01
4. Step 4: Simplify right side
   1,131.17x = 1,075,675.52
5. Step 5: Solve for x
   x = 1,075,675.52/1,131.17
6. Step 6: Final answer
   x = 950.94