Finding the Fourth Proportional to 12,311.20, 18,483.18 and 6,784.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,311.20 : 18,483.18 = 6,784.12 : x
2. Step 2: Convert to fraction form
   12,311.20/18,483.18 = 6,784.12/x
3. Step 3: Cross multiply
   12,311.20x = 18,483.18 × 6,784.12
4. Step 4: Simplify right side
   12,311.20x = 125,392,111.10
5. Step 5: Solve for x
   x = 125,392,111.10/12,311.20
6. Step 6: Final answer
   x = 10,185.21