Finding the Fourth Proportional to 12,077.07, 18,115.59 and 4,285.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,077.07 : 18,115.59 = 4,285.89 : x
2. Step 2: Convert to fraction form
   12,077.07/18,115.59 = 4,285.89/x
3. Step 3: Cross multiply
   12,077.07x = 18,115.59 × 4,285.89
4. Step 4: Simplify right side
   12,077.07x = 77,641,426.03
5. Step 5: Solve for x
   x = 77,641,426.03/12,077.07
6. Step 6: Final answer
   x = 6,428.83