Finding the Fourth Proportional to 2,124.57, 3,185.82 and 663.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,124.57 : 3,185.82 = 663.72 : x
2. Step 2: Convert to fraction form
   2,124.57/3,185.82 = 663.72/x
3. Step 3: Cross multiply
   2,124.57x = 3,185.82 × 663.72
4. Step 4: Simplify right side
   2,124.57x = 2,114,492.45
5. Step 5: Solve for x
   x = 2,114,492.45/2,124.57
6. Step 6: Final answer
   x = 995.26