Finding the Fourth Proportional to 8,898.30, 12,269.70 and 7,278.15

Step by Step Solution

1. Step 1: Write the proportion equation
   8,898.30 : 12,269.70 = 7,278.15 : x
2. Step 2: Convert to fraction form
   8,898.30/12,269.70 = 7,278.15/x
3. Step 3: Cross multiply
   8,898.30x = 12,269.70 × 7,278.15
4. Step 4: Simplify right side
   8,898.30x = 89,300,717.06
5. Step 5: Solve for x
   x = 89,300,717.06/8,898.30
6. Step 6: Final answer
   x = 10,035.71