Finding the Fourth Proportional to 12,111.75, 18,159.81 and 5,783.21

Step by Step Solution

1. Step 1: Write the proportion equation
   12,111.75 : 18,159.81 = 5,783.21 : x
2. Step 2: Convert to fraction form
   12,111.75/18,159.81 = 5,783.21/x
3. Step 3: Cross multiply
   12,111.75x = 18,159.81 × 5,783.21
4. Step 4: Simplify right side
   12,111.75x = 105,021,944.06
5. Step 5: Solve for x
   x = 105,021,944.06/12,111.75
6. Step 6: Final answer
   x = 8,671.08