Finding the Fourth Proportional to 13,932.91, 19,227.42 and 7,964.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,932.91 : 19,227.42 = 7,964.72 : x
2. Step 2: Convert to fraction form
   13,932.91/19,227.42 = 7,964.72/x
3. Step 3: Cross multiply
   13,932.91x = 19,227.42 × 7,964.72
4. Step 4: Simplify right side
   13,932.91x = 153,140,900.57
5. Step 5: Solve for x
   x = 153,140,900.57/13,932.91
6. Step 6: Final answer
   x = 10,991.31