Finding the Fourth Proportional to 13,890.31, 19,168.15 and 7,923.91

Step by Step Solution

1. Step 1: Write the proportion equation
   13,890.31 : 19,168.15 = 7,923.91 : x
2. Step 2: Convert to fraction form
   13,890.31/19,168.15 = 7,923.91/x
3. Step 3: Cross multiply
   13,890.31x = 19,168.15 × 7,923.91
4. Step 4: Simplify right side
   13,890.31x = 151,886,695.47
5. Step 5: Solve for x
   x = 151,886,695.47/13,890.31
6. Step 6: Final answer
   x = 10,934.72