Finding the Fourth Proportional to 2,085.55, 3,128.63 and 624.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.55 : 3,128.63 = 624.51 : x
2. Step 2: Convert to fraction form
   2,085.55/3,128.63 = 624.51/x
3. Step 3: Cross multiply
   2,085.55x = 3,128.63 × 624.51
4. Step 4: Simplify right side
   2,085.55x = 1,953,857.60
5. Step 5: Solve for x
   x = 1,953,857.60/2,085.55
6. Step 6: Final answer
   x = 936.86