Finding the Fourth Proportional to 12,810.61, 19,218.33 and 5,790.54

Step by Step Solution

1. Step 1: Write the proportion equation
   12,810.61 : 19,218.33 = 5,790.54 : x
2. Step 2: Convert to fraction form
   12,810.61/19,218.33 = 5,790.54/x
3. Step 3: Cross multiply
   12,810.61x = 19,218.33 × 5,790.54
4. Step 4: Simplify right side
   12,810.61x = 111,284,508.60
5. Step 5: Solve for x
   x = 111,284,508.60/12,810.61
6. Step 6: Final answer
   x = 8,686.90