Finding the Fourth Proportional to 1,311.32, 1,809.59 and 713.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,311.32 : 1,809.59 = 713.82 : x
2. Step 2: Convert to fraction form
   1,311.32/1,809.59 = 713.82/x
3. Step 3: Cross multiply
   1,311.32x = 1,809.59 × 713.82
4. Step 4: Simplify right side
   1,311.32x = 1,291,721.53
5. Step 5: Solve for x
   x = 1,291,721.53/1,311.32
6. Step 6: Final answer
   x = 985.05