Finding the Fourth Proportional to 1,086.72, 1,632.40 and 654.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.72 : 1,632.40 = 654.08 : x
2. Step 2: Convert to fraction form
   1,086.72/1,632.40 = 654.08/x
3. Step 3: Cross multiply
   1,086.72x = 1,632.40 × 654.08
4. Step 4: Simplify right side
   1,086.72x = 1,067,720.19
5. Step 5: Solve for x
   x = 1,067,720.19/1,086.72
6. Step 6: Final answer
   x = 982.52