Finding the Fourth Proportional to 1,086.57, 1,499.48 and 620.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.57 : 1,499.48 = 620.82 : x
2. Step 2: Convert to fraction form
   1,086.57/1,499.48 = 620.82/x
3. Step 3: Cross multiply
   1,086.57x = 1,499.48 × 620.82
4. Step 4: Simplify right side
   1,086.57x = 930,904.07
5. Step 5: Solve for x
   x = 930,904.07/1,086.57
6. Step 6: Final answer
   x = 856.74