Finding the Fourth Proportional to 2,086.31, 3,129.50 and 699.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.31 : 3,129.50 = 699.39 : x
2. Step 2: Convert to fraction form
   2,086.31/3,129.50 = 699.39/x
3. Step 3: Cross multiply
   2,086.31x = 3,129.50 × 699.39
4. Step 4: Simplify right side
   2,086.31x = 2,188,741.01
5. Step 5: Solve for x
   x = 2,188,741.01/2,086.31
6. Step 6: Final answer
   x = 1,049.10