Finding the Fourth Proportional to 12,991.41, 17,923.89 and 7,950.37

Step by Step Solution

1. Step 1: Write the proportion equation
   12,991.41 : 17,923.89 = 7,950.37 : x
2. Step 2: Convert to fraction form
   12,991.41/17,923.89 = 7,950.37/x
3. Step 3: Cross multiply
   12,991.41x = 17,923.89 × 7,950.37
4. Step 4: Simplify right side
   12,991.41x = 142,501,557.34
5. Step 5: Solve for x
   x = 142,501,557.34/12,991.41
6. Step 6: Final answer
   x = 10,968.91