Finding the Fourth Proportional to 1,086.29, 1,628.67 and 538.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.29 : 1,628.67 = 538.12 : x
2. Step 2: Convert to fraction form
   1,086.29/1,628.67 = 538.12/x
3. Step 3: Cross multiply
   1,086.29x = 1,628.67 × 538.12
4. Step 4: Simplify right side
   1,086.29x = 876,423.95
5. Step 5: Solve for x
   x = 876,423.95/1,086.29
6. Step 6: Final answer
   x = 806.81