Finding the Fourth Proportional to 2,086.59, 3,128.94 and 625.85

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.59 : 3,128.94 = 625.85 : x
2. Step 2: Convert to fraction form
   2,086.59/3,128.94 = 625.85/x
3. Step 3: Cross multiply
   2,086.59x = 3,128.94 × 625.85
4. Step 4: Simplify right side
   2,086.59x = 1,958,239.28
5. Step 5: Solve for x
   x = 1,958,239.28/2,086.59
6. Step 6: Final answer
   x = 938.49