Finding the Fourth Proportional to 12,338.86, 18,505.61 and 3,906.02

Step by Step Solution

1. Step 1: Write the proportion equation
   12,338.86 : 18,505.61 = 3,906.02 : x
2. Step 2: Convert to fraction form
   12,338.86/18,505.61 = 3,906.02/x
3. Step 3: Cross multiply
   12,338.86x = 18,505.61 × 3,906.02
4. Step 4: Simplify right side
   12,338.86x = 72,283,282.77
5. Step 5: Solve for x
   x = 72,283,282.77/12,338.86
6. Step 6: Final answer
   x = 5,858.18