Finding the Fourth Proportional to 5,145.77, 7,717.72 and 1,636.15

Step by Step Solution

1. Step 1: Write the proportion equation
   5,145.77 : 7,717.72 = 1,636.15 : x
2. Step 2: Convert to fraction form
   5,145.77/7,717.72 = 1,636.15/x
3. Step 3: Cross multiply
   5,145.77x = 7,717.72 × 1,636.15
4. Step 4: Simplify right side
   5,145.77x = 12,627,339.43
5. Step 5: Solve for x
   x = 12,627,339.43/5,145.77
6. Step 6: Final answer
   x = 2,453.93