Finding the Fourth Proportional to 2,087.85, 3,131.16 and 626.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.85 : 3,131.16 = 626.61 : x
2. Step 2: Convert to fraction form
   2,087.85/3,131.16 = 626.61/x
3. Step 3: Cross multiply
   2,087.85x = 3,131.16 × 626.61
4. Step 4: Simplify right side
   2,087.85x = 1,962,016.17
5. Step 5: Solve for x
   x = 1,962,016.17/2,087.85
6. Step 6: Final answer
   x = 939.73