Finding the Fourth Proportional to 13,939.06, 19,221.15 and 9,958.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,939.06 : 19,221.15 = 9,958.72 : x
2. Step 2: Convert to fraction form
   13,939.06/19,221.15 = 9,958.72/x
3. Step 3: Cross multiply
   13,939.06x = 19,221.15 × 9,958.72
4. Step 4: Simplify right side
   13,939.06x = 191,418,050.93
5. Step 5: Solve for x
   x = 191,418,050.93/13,939.06
6. Step 6: Final answer
   x = 13,732.49