Finding the Fourth Proportional to 13,890.19, 19,168.61 and 7,922.21

Step by Step Solution

1. Step 1: Write the proportion equation
   13,890.19 : 19,168.61 = 7,922.21 : x
2. Step 2: Convert to fraction form
   13,890.19/19,168.61 = 7,922.21/x
3. Step 3: Cross multiply
   13,890.19x = 19,168.61 × 7,922.21
4. Step 4: Simplify right side
   13,890.19x = 151,857,753.83
5. Step 5: Solve for x
   x = 151,857,753.83/13,890.19
6. Step 6: Final answer
   x = 10,932.73