Finding the Fourth Proportional to 12,661.61, 18,994.57 and 3,896.33

Step by Step Solution

1. Step 1: Write the proportion equation
   12,661.61 : 18,994.57 = 3,896.33 : x
2. Step 2: Convert to fraction form
   12,661.61/18,994.57 = 3,896.33/x
3. Step 3: Cross multiply
   12,661.61x = 18,994.57 × 3,896.33
4. Step 4: Simplify right side
   12,661.61x = 74,009,008.21
5. Step 5: Solve for x
   x = 74,009,008.21/12,661.61
6. Step 6: Final answer
   x = 5,845.15