Finding the Fourth Proportional to 42,828.88, 64,243.11 and 28,567.21

Step by Step Solution

1. Step 1: Write the proportion equation
   42,828.88 : 64,243.11 = 28,567.21 : x
2. Step 2: Convert to fraction form
   42,828.88/64,243.11 = 28,567.21/x
3. Step 3: Cross multiply
   42,828.88x = 64,243.11 × 28,567.21
4. Step 4: Simplify right side
   42,828.88x = 1,835,245,950.37
5. Step 5: Solve for x
   x = 1,835,245,950.37/42,828.88
6. Step 6: Final answer
   x = 42,850.67