Finding the Fourth Proportional to 28,017.63, 42,013.89 and 8,289.27

Step by Step Solution

1. Step 1: Write the proportion equation
   28,017.63 : 42,013.89 = 8,289.27 : x
2. Step 2: Convert to fraction form
   28,017.63/42,013.89 = 8,289.27/x
3. Step 3: Cross multiply
   28,017.63x = 42,013.89 × 8,289.27
4. Step 4: Simplify right side
   28,017.63x = 348,264,477.96
5. Step 5: Solve for x
   x = 348,264,477.96/28,017.63
6. Step 6: Final answer
   x = 12,430.19