Finding the Fourth Proportional to 13,890.69, 19,169.30 and 7,922.71

Step by Step Solution

1. Step 1: Write the proportion equation
   13,890.69 : 19,169.30 = 7,922.71 : x
2. Step 2: Convert to fraction form
   13,890.69/19,169.30 = 7,922.71/x
3. Step 3: Cross multiply
   13,890.69x = 19,169.30 × 7,922.71
4. Step 4: Simplify right side
   13,890.69x = 151,872,776.69
5. Step 5: Solve for x
   x = 151,872,776.69/13,890.69
6. Step 6: Final answer
   x = 10,933.42