Finding the Fourth Proportional to 1,086.14, 1,498.94 and 620.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.14 : 1,498.94 = 620.38 : x
2. Step 2: Convert to fraction form
   1,086.14/1,498.94 = 620.38/x
3. Step 3: Cross multiply
   1,086.14x = 1,498.94 × 620.38
4. Step 4: Simplify right side
   1,086.14x = 929,912.40
5. Step 5: Solve for x
   x = 929,912.40/1,086.14
6. Step 6: Final answer
   x = 856.16