Finding the Fourth Proportional to 1,086.71, 1,499.52 and 620.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.71 : 1,499.52 = 620.96 : x
2. Step 2: Convert to fraction form
   1,086.71/1,499.52 = 620.96/x
3. Step 3: Cross multiply
   1,086.71x = 1,499.52 × 620.96
4. Step 4: Simplify right side
   1,086.71x = 931,134.44
5. Step 5: Solve for x
   x = 931,134.44/1,086.71
6. Step 6: Final answer
   x = 856.84