Finding the Fourth Proportional to 8,789.12, 12,128.88 and 4,810.18

Step by Step Solution

1. Step 1: Write the proportion equation
   8,789.12 : 12,128.88 = 4,810.18 : x
2. Step 2: Convert to fraction form
   8,789.12/12,128.88 = 4,810.18/x
3. Step 3: Cross multiply
   8,789.12x = 12,128.88 × 4,810.18
4. Step 4: Simplify right side
   8,789.12x = 58,342,096.00
5. Step 5: Solve for x
   x = 58,342,096.00/8,789.12
6. Step 6: Final answer
   x = 6,637.99