Finding the Fourth Proportional to 10,778.56, 14,857.46 and 9,874.60

Step by Step Solution

1. Step 1: Write the proportion equation
   10,778.56 : 14,857.46 = 9,874.60 : x
2. Step 2: Convert to fraction form
   10,778.56/14,857.46 = 9,874.60/x
3. Step 3: Cross multiply
   10,778.56x = 14,857.46 × 9,874.60
4. Step 4: Simplify right side
   10,778.56x = 146,711,474.52
5. Step 5: Solve for x
   x = 146,711,474.52/10,778.56
6. Step 6: Final answer
   x = 13,611.42