Finding the Fourth Proportional to 10,855.47, 14,978.60 and 6,380.12

Step by Step Solution

1. Step 1: Write the proportion equation
   10,855.47 : 14,978.60 = 6,380.12 : x
2. Step 2: Convert to fraction form
   10,855.47/14,978.60 = 6,380.12/x
3. Step 3: Cross multiply
   10,855.47x = 14,978.60 × 6,380.12
4. Step 4: Simplify right side
   10,855.47x = 95,565,288.66
5. Step 5: Solve for x
   x = 95,565,288.66/10,855.47
6. Step 6: Final answer
   x = 8,803.42