Finding the Fourth Proportional to 8,898.14, 12,278.61 and 5,120.30

Step by Step Solution

1. Step 1: Write the proportion equation
   8,898.14 : 12,278.61 = 5,120.30 : x
2. Step 2: Convert to fraction form
   8,898.14/12,278.61 = 5,120.30/x
3. Step 3: Cross multiply
   8,898.14x = 12,278.61 × 5,120.30
4. Step 4: Simplify right side
   8,898.14x = 62,870,105.39
5. Step 5: Solve for x
   x = 62,870,105.39/8,898.14
6. Step 6: Final answer
   x = 7,065.54