Finding the Fourth Proportional to 11,991.21, 16,558.29 and 7,522.62

Step by Step Solution

1. Step 1: Write the proportion equation
   11,991.21 : 16,558.29 = 7,522.62 : x
2. Step 2: Convert to fraction form
   11,991.21/16,558.29 = 7,522.62/x
3. Step 3: Cross multiply
   11,991.21x = 16,558.29 × 7,522.62
4. Step 4: Simplify right side
   11,991.21x = 124,561,723.52
5. Step 5: Solve for x
   x = 124,561,723.52/11,991.21
6. Step 6: Final answer
   x = 10,387.75