Finding the Fourth Proportional to 8,789.13, 12,128.87 and 4,810.19

Step by Step Solution

1. Step 1: Write the proportion equation
   8,789.13 : 12,128.87 = 4,810.19 : x
2. Step 2: Convert to fraction form
   8,789.13/12,128.87 = 4,810.19/x
3. Step 3: Cross multiply
   8,789.13x = 12,128.87 × 4,810.19
4. Step 4: Simplify right side
   8,789.13x = 58,342,120.57
5. Step 5: Solve for x
   x = 58,342,120.57/8,789.13
6. Step 6: Final answer
   x = 6,637.99