Finding the Fourth Proportional to 8,789.30, 12,128.90 and 4,810.38

Step by Step Solution

1. Step 1: Write the proportion equation
   8,789.30 : 12,128.90 = 4,810.38 : x
2. Step 2: Convert to fraction form
   8,789.30/12,128.90 = 4,810.38/x
3. Step 3: Cross multiply
   8,789.30x = 12,128.90 × 4,810.38
4. Step 4: Simplify right side
   8,789.30x = 58,344,617.98
5. Step 5: Solve for x
   x = 58,344,617.98/8,789.30
6. Step 6: Final answer
   x = 6,638.14