Finding the Fourth Proportional to 11,898.10, 16,398.88 and 7,912.09

Step by Step Solution

1. Step 1: Write the proportion equation
   11,898.10 : 16,398.88 = 7,912.09 : x
2. Step 2: Convert to fraction form
   11,898.10/16,398.88 = 7,912.09/x
3. Step 3: Cross multiply
   11,898.10x = 16,398.88 × 7,912.09
4. Step 4: Simplify right side
   11,898.10x = 129,749,414.46
5. Step 5: Solve for x
   x = 129,749,414.46/11,898.10
6. Step 6: Final answer
   x = 10,905.05