Finding the Fourth Proportional to 13,378.91, 18,471.83 and 8,345.15

Step by Step Solution

1. Step 1: Write the proportion equation
   13,378.91 : 18,471.83 = 8,345.15 : x
2. Step 2: Convert to fraction form
   13,378.91/18,471.83 = 8,345.15/x
3. Step 3: Cross multiply
   13,378.91x = 18,471.83 × 8,345.15
4. Step 4: Simplify right side
   13,378.91x = 154,150,150.40
5. Step 5: Solve for x
   x = 154,150,150.40/13,378.91
6. Step 6: Final answer
   x = 11,521.88