Finding the Fourth Proportional to 8,085.22, 12,128.34 and 2,538.79

Step by Step Solution

1. Step 1: Write the proportion equation
   8,085.22 : 12,128.34 = 2,538.79 : x
2. Step 2: Convert to fraction form
   8,085.22/12,128.34 = 2,538.79/x
3. Step 3: Cross multiply
   8,085.22x = 12,128.34 × 2,538.79
4. Step 4: Simplify right side
   8,085.22x = 30,791,287.51
5. Step 5: Solve for x
   x = 30,791,287.51/8,085.22
6. Step 6: Final answer
   x = 3,808.34