Finding the Fourth Proportional to 2,086.22, 3,128.90 and 624.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.22 : 3,128.90 = 624.98 : x
2. Step 2: Convert to fraction form
   2,086.22/3,128.90 = 624.98/x
3. Step 3: Cross multiply
   2,086.22x = 3,128.90 × 624.98
4. Step 4: Simplify right side
   2,086.22x = 1,955,504.62
5. Step 5: Solve for x
   x = 1,955,504.62/2,086.22
6. Step 6: Final answer
   x = 937.34