Finding the Fourth Proportional to 9,998.21, 14,993.89 and 7,216.63

Step by Step Solution

1. Step 1: Write the proportion equation
   9,998.21 : 14,993.89 = 7,216.63 : x
2. Step 2: Convert to fraction form
   9,998.21/14,993.89 = 7,216.63/x
3. Step 3: Cross multiply
   9,998.21x = 14,993.89 × 7,216.63
4. Step 4: Simplify right side
   9,998.21x = 108,205,300.86
5. Step 5: Solve for x
   x = 108,205,300.86/9,998.21
6. Step 6: Final answer
   x = 10,822.46