Finding the Fourth Proportional to 8,109.86, 12,155.79 and 3,722.90

Step by Step Solution

1. Step 1: Write the proportion equation
   8,109.86 : 12,155.79 = 3,722.90 : x
2. Step 2: Convert to fraction form
   8,109.86/12,155.79 = 3,722.90/x
3. Step 3: Cross multiply
   8,109.86x = 12,155.79 × 3,722.90
4. Step 4: Simplify right side
   8,109.86x = 45,254,790.59
5. Step 5: Solve for x
   x = 45,254,790.59/8,109.86
6. Step 6: Final answer
   x = 5,580.22