Finding the Fourth Proportional to 8,705.78, 12,014.22 and 5,121.00

Step by Step Solution

1. Step 1: Write the proportion equation
   8,705.78 : 12,014.22 = 5,121.00 : x
2. Step 2: Convert to fraction form
   8,705.78/12,014.22 = 5,121.00/x
3. Step 3: Cross multiply
   8,705.78x = 12,014.22 × 5,121.00
4. Step 4: Simplify right side
   8,705.78x = 61,524,775.57
5. Step 5: Solve for x
   x = 61,524,775.57/8,705.78
6. Step 6: Final answer
   x = 7,067.12