Finding the Fourth Proportional to 12,005.31, 18,007.73 and 5,426.79

Step by Step Solution

1. Step 1: Write the proportion equation
   12,005.31 : 18,007.73 = 5,426.79 : x
2. Step 2: Convert to fraction form
   12,005.31/18,007.73 = 5,426.79/x
3. Step 3: Cross multiply
   12,005.31x = 18,007.73 × 5,426.79
4. Step 4: Simplify right side
   12,005.31x = 97,724,141.95
5. Step 5: Solve for x
   x = 97,724,141.95/12,005.31
6. Step 6: Final answer
   x = 8,140.08