Finding the Fourth Proportional to 8,850.55, 12,213.31 and 4,870.90

Step by Step Solution

1. Step 1: Write the proportion equation
   8,850.55 : 12,213.31 = 4,870.90 : x
2. Step 2: Convert to fraction form
   8,850.55/12,213.31 = 4,870.90/x
3. Step 3: Cross multiply
   8,850.55x = 12,213.31 × 4,870.90
4. Step 4: Simplify right side
   8,850.55x = 59,489,789.50
5. Step 5: Solve for x
   x = 59,489,789.50/8,850.55
6. Step 6: Final answer
   x = 6,721.59