Finding the Fourth Proportional to 12,372.18, 18,556.29 and 3,605.05

Step by Step Solution

1. Step 1: Write the proportion equation
   12,372.18 : 18,556.29 = 3,605.05 : x
2. Step 2: Convert to fraction form
   12,372.18/18,556.29 = 3,605.05/x
3. Step 3: Cross multiply
   12,372.18x = 18,556.29 × 3,605.05
4. Step 4: Simplify right side
   12,372.18x = 66,896,260.48
5. Step 5: Solve for x
   x = 66,896,260.48/12,372.18
6. Step 6: Final answer
   x = 5,406.99