Finding the Fourth Proportional to 1,131.96, 1,561.59 and 869.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.96 : 1,561.59 = 869.52 : x
2. Step 2: Convert to fraction form
   1,131.96/1,561.59 = 869.52/x
3. Step 3: Cross multiply
   1,131.96x = 1,561.59 × 869.52
4. Step 4: Simplify right side
   1,131.96x = 1,357,833.74
5. Step 5: Solve for x
   x = 1,357,833.74/1,131.96
6. Step 6: Final answer
   x = 1,199.54