Finding the Fourth Proportional to 8,498.78, 12,748.98 and 3,305.06

Step by Step Solution

1. Step 1: Write the proportion equation
   8,498.78 : 12,748.98 = 3,305.06 : x
2. Step 2: Convert to fraction form
   8,498.78/12,748.98 = 3,305.06/x
3. Step 3: Cross multiply
   8,498.78x = 12,748.98 × 3,305.06
4. Step 4: Simplify right side
   8,498.78x = 42,136,143.84
5. Step 5: Solve for x
   x = 42,136,143.84/8,498.78
6. Step 6: Final answer
   x = 4,957.90