Finding the Fourth Proportional to 8,602.06, 12,905.31 and 2,758.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,602.06 : 12,905.31 = 2,758.72 : x
2. Step 2: Convert to fraction form
   8,602.06/12,905.31 = 2,758.72/x
3. Step 3: Cross multiply
   8,602.06x = 12,905.31 × 2,758.72
4. Step 4: Simplify right side
   8,602.06x = 35,602,136.80
5. Step 5: Solve for x
   x = 35,602,136.80/8,602.06
6. Step 6: Final answer
   x = 4,138.79