Finding the Fourth Proportional to 10,855.50, 14,980.59 and 6,139.68

Step by Step Solution

1. Step 1: Write the proportion equation
   10,855.50 : 14,980.59 = 6,139.68 : x
2. Step 2: Convert to fraction form
   10,855.50/14,980.59 = 6,139.68/x
3. Step 3: Cross multiply
   10,855.50x = 14,980.59 × 6,139.68
4. Step 4: Simplify right side
   10,855.50x = 91,976,028.81
5. Step 5: Solve for x
   x = 91,976,028.81/10,855.50
6. Step 6: Final answer
   x = 8,472.76