Finding the Fourth Proportional to 8,103.09, 12,156.61 and 3,420.58

Step by Step Solution

1. Step 1: Write the proportion equation
   8,103.09 : 12,156.61 = 3,420.58 : x
2. Step 2: Convert to fraction form
   8,103.09/12,156.61 = 3,420.58/x
3. Step 3: Cross multiply
   8,103.09x = 12,156.61 × 3,420.58
4. Step 4: Simplify right side
   8,103.09x = 41,582,657.03
5. Step 5: Solve for x
   x = 41,582,657.03/8,103.09
6. Step 6: Final answer
   x = 5,131.70