Finding the Fourth Proportional to 8,613.02, 12,978.14 and 7,087.25

Step by Step Solution

1. Step 1: Write the proportion equation
   8,613.02 : 12,978.14 = 7,087.25 : x
2. Step 2: Convert to fraction form
   8,613.02/12,978.14 = 7,087.25/x
3. Step 3: Cross multiply
   8,613.02x = 12,978.14 × 7,087.25
4. Step 4: Simplify right side
   8,613.02x = 91,979,256.69
5. Step 5: Solve for x
   x = 91,979,256.69/8,613.02
6. Step 6: Final answer
   x = 10,679.09