Finding the Fourth Proportional to 13,919.31, 19,208.72 and 8,330.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,919.31 : 19,208.72 = 8,330.31 : x
2. Step 2: Convert to fraction form
   13,919.31/19,208.72 = 8,330.31/x
3. Step 3: Cross multiply
   13,919.31x = 19,208.72 × 8,330.31
4. Step 4: Simplify right side
   13,919.31x = 160,014,592.30
5. Step 5: Solve for x
   x = 160,014,592.30/13,919.31
6. Step 6: Final answer
   x = 11,495.87