Finding the Fourth Proportional to 12,155.16, 18,232.80 and 3,390.05

Step by Step Solution

1. Step 1: Write the proportion equation
   12,155.16 : 18,232.80 = 3,390.05 : x
2. Step 2: Convert to fraction form
   12,155.16/18,232.80 = 3,390.05/x
3. Step 3: Cross multiply
   12,155.16x = 18,232.80 × 3,390.05
4. Step 4: Simplify right side
   12,155.16x = 61,810,136.51
5. Step 5: Solve for x
   x = 61,810,136.51/12,155.16
6. Step 6: Final answer
   x = 5,085.09