Finding the Fourth Proportional to 13,890.69, 19,169.31 and 7,922.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,890.69 : 19,169.31 = 7,922.72 : x
2. Step 2: Convert to fraction form
   13,890.69/19,169.31 = 7,922.72/x
3. Step 3: Cross multiply
   13,890.69x = 19,169.31 × 7,922.72
4. Step 4: Simplify right side
   13,890.69x = 151,872,979.88
5. Step 5: Solve for x
   x = 151,872,979.88/13,890.69
6. Step 6: Final answer
   x = 10,933.44