Finding the Fourth Proportional to 14,159.31, 21,229.59 and 7,919.98

Step by Step Solution

1. Step 1: Write the proportion equation
   14,159.31 : 21,229.59 = 7,919.98 : x
2. Step 2: Convert to fraction form
   14,159.31/21,229.59 = 7,919.98/x
3. Step 3: Cross multiply
   14,159.31x = 21,229.59 × 7,919.98
4. Step 4: Simplify right side
   14,159.31x = 168,137,904.83
5. Step 5: Solve for x
   x = 168,137,904.83/14,159.31
6. Step 6: Final answer
   x = 11,874.73