Finding the Fourth Proportional to 28,218.10, 42,322.82 and 7,443.22

Step by Step Solution

1. Step 1: Write the proportion equation
   28,218.10 : 42,322.82 = 7,443.22 : x
2. Step 2: Convert to fraction form
   28,218.10/42,322.82 = 7,443.22/x
3. Step 3: Cross multiply
   28,218.10x = 42,322.82 × 7,443.22
4. Step 4: Simplify right side
   28,218.10x = 315,018,060.28
5. Step 5: Solve for x
   x = 315,018,060.28/28,218.10
6. Step 6: Final answer
   x = 11,163.69