Finding the Fourth Proportional to 1,131.66, 1,561.41 and 712.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.66 : 1,561.41 = 712.08 : x
2. Step 2: Convert to fraction form
   1,131.66/1,561.41 = 712.08/x
3. Step 3: Cross multiply
   1,131.66x = 1,561.41 × 712.08
4. Step 4: Simplify right side
   1,131.66x = 1,111,848.83
5. Step 5: Solve for x
   x = 1,111,848.83/1,131.66
6. Step 6: Final answer
   x = 982.49