Finding the Fourth Proportional to 12,155.59, 18,236.46 and 3,390.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,155.59 : 18,236.46 = 3,390.50 : x
2. Step 2: Convert to fraction form
   12,155.59/18,236.46 = 3,390.50/x
3. Step 3: Cross multiply
   12,155.59x = 18,236.46 × 3,390.50
4. Step 4: Simplify right side
   12,155.59x = 61,830,775.94
5. Step 5: Solve for x
   x = 61,830,775.94/12,155.59
6. Step 6: Final answer
   x = 5,086.61