Finding the Fourth Proportional to 14,178.72, 19,566.64 and 7,890.96

Step by Step Solution

1. Step 1: Write the proportion equation
   14,178.72 : 19,566.64 = 7,890.96 : x
2. Step 2: Convert to fraction form
   14,178.72/19,566.64 = 7,890.96/x
3. Step 3: Cross multiply
   14,178.72x = 19,566.64 × 7,890.96
4. Step 4: Simplify right side
   14,178.72x = 154,399,573.57
5. Step 5: Solve for x
   x = 154,399,573.57/14,178.72
6. Step 6: Final answer
   x = 10,889.53