Finding the Fourth Proportional to 8,085.18, 12,129.93 and 3,402.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,085.18 : 12,129.93 = 3,402.72 : x
2. Step 2: Convert to fraction form
   8,085.18/12,129.93 = 3,402.72/x
3. Step 3: Cross multiply
   8,085.18x = 12,129.93 × 3,402.72
4. Step 4: Simplify right side
   8,085.18x = 41,274,755.41
5. Step 5: Solve for x
   x = 41,274,755.41/8,085.18
6. Step 6: Final answer
   x = 5,104.99