Finding the Fourth Proportional to 12,111.92, 18,164.04 and 3,902

Step by Step Solution

1. Step 1: Write the proportion equation
   12,111.92 : 18,164.04 = 3,902 : x
2. Step 2: Convert to fraction form
   12,111.92/18,164.04 = 3,902/x
3. Step 3: Cross multiply
   12,111.92x = 18,164.04 × 3,902
4. Step 4: Simplify right side
   12,111.92x = 70,876,084.08
5. Step 5: Solve for x
   x = 70,876,084.08/12,111.92
6. Step 6: Final answer
   x = 5,851.76