Finding the Fourth Proportional to 1,131.74, 1,561.25 and 711.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.74 : 1,561.25 = 711.88 : x
2. Step 2: Convert to fraction form
   1,131.74/1,561.25 = 711.88/x
3. Step 3: Cross multiply
   1,131.74x = 1,561.25 × 711.88
4. Step 4: Simplify right side
   1,131.74x = 1,111,422.65
5. Step 5: Solve for x
   x = 1,111,422.65/1,131.74
6. Step 6: Final answer
   x = 982.05