Finding the Fourth Proportional to 1,086.91, 1,628.48 and 653.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.91 : 1,628.48 = 653.11 : x
2. Step 2: Convert to fraction form
   1,086.91/1,628.48 = 653.11/x
3. Step 3: Cross multiply
   1,086.91x = 1,628.48 × 653.11
4. Step 4: Simplify right side
   1,086.91x = 1,063,573.31
5. Step 5: Solve for x
   x = 1,063,573.31/1,086.91
6. Step 6: Final answer
   x = 978.53