Finding the Fourth Proportional to 13,128.16, 19,688.88 and 3,892

Step by Step Solution

1. Step 1: Write the proportion equation
   13,128.16 : 19,688.88 = 3,892 : x
2. Step 2: Convert to fraction form
   13,128.16/19,688.88 = 3,892/x
3. Step 3: Cross multiply
   13,128.16x = 19,688.88 × 3,892
4. Step 4: Simplify right side
   13,128.16x = 76,629,120.96
5. Step 5: Solve for x
   x = 76,629,120.96/13,128.16
6. Step 6: Final answer
   x = 5,837.00