Finding the Fourth Proportional to 12,009.18, 18,005.24 and 4,607.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,009.18 : 18,005.24 = 4,607.40 : x
2. Step 2: Convert to fraction form
   12,009.18/18,005.24 = 4,607.40/x
3. Step 3: Cross multiply
   12,009.18x = 18,005.24 × 4,607.40
4. Step 4: Simplify right side
   12,009.18x = 82,957,342.78
5. Step 5: Solve for x
   x = 82,957,342.78/12,009.18
6. Step 6: Final answer
   x = 6,907.83