Finding the Fourth Proportional to 1,086.57, 1,498.47 and 816.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.57 : 1,498.47 = 816.32 : x
2. Step 2: Convert to fraction form
   1,086.57/1,498.47 = 816.32/x
3. Step 3: Cross multiply
   1,086.57x = 1,498.47 × 816.32
4. Step 4: Simplify right side
   1,086.57x = 1,223,231.03
5. Step 5: Solve for x
   x = 1,223,231.03/1,086.57
6. Step 6: Final answer
   x = 1,125.77