Finding the Fourth Proportional to 28,238.07, 42,360.78 and 8,518.62

Step by Step Solution

1. Step 1: Write the proportion equation
   28,238.07 : 42,360.78 = 8,518.62 : x
2. Step 2: Convert to fraction form
   28,238.07/42,360.78 = 8,518.62/x
3. Step 3: Cross multiply
   28,238.07x = 42,360.78 × 8,518.62
4. Step 4: Simplify right side
   28,238.07x = 360,855,387.72
5. Step 5: Solve for x
   x = 360,855,387.72/28,238.07
6. Step 6: Final answer
   x = 12,779.04