Finding the Fourth Proportional to 2,124.53, 3,186.72 and 663.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,124.53 : 3,186.72 = 663.69 : x
2. Step 2: Convert to fraction form
   2,124.53/3,186.72 = 663.69/x
3. Step 3: Cross multiply
   2,124.53x = 3,186.72 × 663.69
4. Step 4: Simplify right side
   2,124.53x = 2,114,994.20
5. Step 5: Solve for x
   x = 2,114,994.20/2,124.53
6. Step 6: Final answer
   x = 995.51