Finding the Fourth Proportional to 12,178.55, 16,800.72 and 7,708.91

Step by Step Solution

1. Step 1: Write the proportion equation
   12,178.55 : 16,800.72 = 7,708.91 : x
2. Step 2: Convert to fraction form
   12,178.55/16,800.72 = 7,708.91/x
3. Step 3: Cross multiply
   12,178.55x = 16,800.72 × 7,708.91
4. Step 4: Simplify right side
   12,178.55x = 129,515,125.50
5. Step 5: Solve for x
   x = 129,515,125.50/12,178.55
6. Step 6: Final answer
   x = 10,634.69