Finding the Fourth Proportional to 8,421.52, 12,650.52 and 5,136.58

Step by Step Solution

1. Step 1: Write the proportion equation
   8,421.52 : 12,650.52 = 5,136.58 : x
2. Step 2: Convert to fraction form
   8,421.52/12,650.52 = 5,136.58/x
3. Step 3: Cross multiply
   8,421.52x = 12,650.52 × 5,136.58
4. Step 4: Simplify right side
   8,421.52x = 64,980,408.02
5. Step 5: Solve for x
   x = 64,980,408.02/8,421.52
6. Step 6: Final answer
   x = 7,716.00