Finding the Fourth Proportional to 14,123.72, 21,171.84 and 7,877.96

Step by Step Solution

1. Step 1: Write the proportion equation
   14,123.72 : 21,171.84 = 7,877.96 : x
2. Step 2: Convert to fraction form
   14,123.72/21,171.84 = 7,877.96/x
3. Step 3: Cross multiply
   14,123.72x = 21,171.84 × 7,877.96
4. Step 4: Simplify right side
   14,123.72x = 166,790,908.65
5. Step 5: Solve for x
   x = 166,790,908.65/14,123.72
6. Step 6: Final answer
   x = 11,809.28