Finding the Fourth Proportional to 12,990.41, 17,922.51 and 7,949.37

Step by Step Solution

1. Step 1: Write the proportion equation
   12,990.41 : 17,922.51 = 7,949.37 : x
2. Step 2: Convert to fraction form
   12,990.41/17,922.51 = 7,949.37/x
3. Step 3: Cross multiply
   12,990.41x = 17,922.51 × 7,949.37
4. Step 4: Simplify right side
   12,990.41x = 142,472,663.32
5. Step 5: Solve for x
   x = 142,472,663.32/12,990.41
6. Step 6: Final answer
   x = 10,967.53