Finding the Fourth Proportional to 28,308.34, 42,462.61 and 8,587.07

Step by Step Solution

1. Step 1: Write the proportion equation
   28,308.34 : 42,462.61 = 8,587.07 : x
2. Step 2: Convert to fraction form
   28,308.34/42,462.61 = 8,587.07/x
3. Step 3: Cross multiply
   28,308.34x = 42,462.61 × 8,587.07
4. Step 4: Simplify right side
   28,308.34x = 364,629,170.67
5. Step 5: Solve for x
   x = 364,629,170.67/28,308.34
6. Step 6: Final answer
   x = 12,880.63