Finding the Fourth Proportional to 8,789.39, 12,129.42 and 4,810.56

Step by Step Solution

1. Step 1: Write the proportion equation
   8,789.39 : 12,129.42 = 4,810.56 : x
2. Step 2: Convert to fraction form
   8,789.39/12,129.42 = 4,810.56/x
3. Step 3: Cross multiply
   8,789.39x = 12,129.42 × 4,810.56
4. Step 4: Simplify right side
   8,789.39x = 58,349,364.04
5. Step 5: Solve for x
   x = 58,349,364.04/8,789.39
6. Step 6: Final answer
   x = 6,638.62