Finding the Fourth Proportional to 8,460.31, 12,690.15 and 2,220.27

Step by Step Solution

1. Step 1: Write the proportion equation
   8,460.31 : 12,690.15 = 2,220.27 : x
2. Step 2: Convert to fraction form
   8,460.31/12,690.15 = 2,220.27/x
3. Step 3: Cross multiply
   8,460.31x = 12,690.15 × 2,220.27
4. Step 4: Simplify right side
   8,460.31x = 28,175,559.34
5. Step 5: Solve for x
   x = 28,175,559.34/8,460.31
6. Step 6: Final answer
   x = 3,330.32