Finding the Fourth Proportional to 2,085.62, 3,128.88 and 624.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.62 : 3,128.88 = 624.78 : x
2. Step 2: Convert to fraction form
   2,085.62/3,128.88 = 624.78/x
3. Step 3: Cross multiply
   2,085.62x = 3,128.88 × 624.78
4. Step 4: Simplify right side
   2,085.62x = 1,954,861.65
5. Step 5: Solve for x
   x = 1,954,861.65/2,085.62
6. Step 6: Final answer
   x = 937.31